Frontend fixes library

Frontend Fixes for Real CSS, HTML & Layout Bugs

FrontFixer is a practical debugging library for real CSS, HTML, responsive design, Grid, Flexbox, overflow, spacing, sizing, layering, and interaction problems. Start with the symptom you can see, understand the browser behavior behind it, and move toward a cleaner fix.

Real-world debugging cases
Broken and corrected code
Visual examples when useful
New fixes added automatically

This is the central FrontFixer debugging library. Instead of starting with a long generic tutorial, use the visible symptom to find the guide that is closest to the problem on your screen.

A horizontal scrollbar, a dropdown hidden behind another element, a Grid layout breaking on mobile, a Flexbox item refusing to shrink, or a button that cannot be clicked can look simple while being caused by very different browser rules. The goal of each fix is to identify that cause before changing random CSS.

You can also browse the focused CSS Fixes, HTML Fixes, and Responsive Design sections.

Diagnose Start with the visible symptom instead of guessing which property is wrong.

Understand Identify the layout, sizing, overflow, stacking, or structural rule behind the bug.

Compare Use broken and corrected examples to see exactly what changes the browser behavior.

Verify Test the correction across the surrounding layout and relevant screen sizes.

A debugging library built around real symptoms

Frontend problems often share the same visual symptom while having different causes. Horizontal overflow can come from width, Grid tracks, Flexbox minimum sizes, images, margins, transforms, or positioned elements. Layering problems can come from stacking contexts rather than the z-index value itself.

That is why FrontFixer separates broad debugging guides from more specific cases. Start with the closest symptom, compare the pattern, and move deeper only when the specific browser behavior requires it.

1. Name the symptom Identify what is visibly wrong before changing the code.

2. Find the cause Compare the surrounding HTML and CSS with the closest debugging pattern.

3. Test the fix Verify the correction on the actual component and across relevant screen sizes.

Start here

Popular frontend fixes

Start with the FrontFixer guides developers reach most often when debugging common CSS, layout, responsive, and interaction problems.

Layering

Fix z-index not working

Learn why z-index is not working in CSS. Fix stacking context, position, overflow, transform, dropdown, modal, and header layering problems.

Open fix Media

Why Is My Image Stretching or Squashed in CSS?

Learn why images stretch or look squashed in CSS, how width, height, aspect-ratio, and object-fit cause the problem, and how to fix responsive images…

Open fix Overflow

Horizontal Scroll on Mobile? Fix the Hidden CSS Bug

Horizontal scroll on mobile? Find and fix the hidden CSS bug caused by 100vw, fixed widths, grid, flex, long text, images, tables, and overflow.

Open fix Interaction

Why Is My Hover Effect Not Working?

Hover effect not working in CSS? Learn how to fix selector mistakes, specificity conflicts, overlays, pointer-events, disabled elements, and touch-device hover issues.

Open fix Responsive

Fix responsive design not working

Fix responsive design problems with practical examples for media queries, containers, overflow, images, flexbox, CSS Grid, and mobile layouts.

Open fix Flexbox

Fix Flexbox not centering (the right way)

Flexbox not centering your element? Learn how wrong axes, missing height, wrong parents, and full-width children break Flexbox alignment

Open fix Positioning

Fix position: sticky not working

Is position: sticky not working in CSS? Learn why missing top values, parent overflow, flex/grid layouts, short containers, and scroll contexts break sticky elements.

Open fix CSS Grid

Fix CSS Grid Breaking on Mobile

CSS Grid breaking on mobile? Fix grid overflow, minmax issues, rigid columns, large gaps, child overflow, and mobile layout bugs.

Open fix Interaction

Why Is My Button Not Clickable?

Button not clickable even though it looks normal? Learn how overlays, pointer-events, disabled states, z-index, and broken HTML structure can block clicks.

Open fix CSS Grid

CSS Grid Breaks on Safari? Fix the Real Browser Bug

CSS Grid breaks on Safari but works in Chrome? Learn how to fix 1fr sizing traps, min-width issues, overflowing children, media bugs, and iPhone…

Open fix

Full library

All frontend fixes

Browse the complete debugging library. New FrontFixer guides are added here automatically as they are published.

CSS Cascade

Why does CSS specificity override my fix?

Fix CSS specificity overrides fix bugs by learning how selectors, cascade order, inline styles, important rules, and component CSS beat your changes.

Open fix Fix

Why does an empty element create unexpected space?

Fix empty element unexpected space bugs by finding hidden divs, empty wrappers, margins, padding, line-height, pseudo-elements, and layout placeholders.

Open fix HTML

Why does invalid HTML nesting break CSS layout?

Fix invalid HTML nesting breaks layout bugs by learning how broken parent-child structure, misplaced tags, and browser auto-correction change CSS behavior.

Open fix CSS Cascade

Why do duplicate IDs break CSS selectors?

Fix duplicate IDs break CSS selectors bugs by learning why repeated id attributes confuse styling, anchors, labels, scripts, and component targeting.

Open fix Responsive

Why Does a Checkbox Label Wrap Wrong on Mobile?

Fix checkbox label wraps wrong mobile bugs by aligning checkbox inputs, label text, tap targets, gaps, and responsive form wrapping.

Open fix Interaction

Submit Button Drops Next Line? Fix the CSS Layout

Submit button drops next line? Fix input width, button sizing, flex wrapping, gaps, long CTA text, and mobile form stacking.

Open fix Forms

Why Is Input Text Hidden Behind an Icon?

Fix input text hidden behind icon bugs by reserving icon space with padding, positioning icons safely, and protecting focus, password, and search fields.

Open fix Overflow

Form Row Overflows Mobile Width? Fix the CSS Layout

Form row overflows mobile width? Fix grid columns, min-width, gaps, padding, fixed inputs, and buttons that cause horizontal scroll.

Open fix Forms

Select Box Looks Different From Input? Fix the CSS Mismatch

Select box looks different from input? Fix browser defaults, mismatched height, font inheritance, arrow spacing, and mobile select styling.

Open fix Typography

Why Does Textarea Resize Break the Layout?

Fix textarea resize breaks layout bugs by controlling resize direction, max sizes, overflow, and responsive form wrappers before users drag fields apart.

Open fix Fix

Why does my SVG stretch or squash in CSS?

Fix SVG stretching in CSS by learning why viewBox, preserveAspectRatio, forced width, height, icons, and logo shells distort SVGs.

Open fix Media

Why Does a Background Image Jump When the Screen Resizes?

Fix background image jumps on resize bugs by learning why cover, fixed heights, focal points, and mobile breakpoints move images unexpectedly.

Open fix Overflow

Why Does an Embedded Map Overflow on Mobile?

Fix embedded map overflow mobile bugs by learning why iframe widths, 100vw wrappers, and map widgets push pages wider than phones.

Open fix Sizing

Why Does an iframe Break Mobile Width?

Fix iframe breaks mobile width bugs by learning why fixed embed widths, wrappers, flex items, and 100vw iframe rules cause overflow.

Open fix Media

Why Is My Responsive Video Taller Than Expected?

Fix responsive video too tall bugs by learning why iframe heights, padding hacks, aspect-ratio rules, and parent widths make embeds oversized.

Open fix Media

Why Does an Image Without Width and Height Shift the Page?

Fix image missing width height layout shift bugs by learning why missing dimensions, wrong ratios, and unstable media boxes move content.

Open fix Media

Why Does Lazy Loading Cause Image Layout Shift?

Fix lazy loading image layout shift bugs by learning why missing dimensions, wrong placeholders, and delayed media make content jump.

Open fix Overflow

Why Does My Image Overflow Even With max-width:100%?

Fix image overflow max-width 100 bugs by learning why parents, flex items, grid tracks, and wrappers still make images overflow.

Open fix Sizing

Why Does aspect-ratio Break With Fixed Height?

Fix aspect-ratio fixed height bugs by learning why fixed heights override ratio behavior and how to let media wrappers calculate height.

Open fix Fix

Why Is My aspect-ratio Ignored in CSS?

Fix aspect-ratio ignored in CSS bugs by learning why fixed sizes, content, grid pressure, and image rules override the ratio.

Open fix Layering

Why Parent Z-index Traps Child Elements?

Fix parent z-index traps child elements bugs by learning why high child z-index values cannot escape a lower parent stacking layer.

Open fix Fix

Why Does My Overlay Not Cover the Whole Page?

Fix overlay not covering whole page bugs by learning why parent sizing, headers, scroll containers, and grid columns limit coverage.

Open fix Interaction

Why Does My Modal Stay Trapped Inside a Parent?

Fix modal trapped inside parent bugs by learning why cards, sections, scroll containers, and clipped parents can trap dialogs.

Open fix Forms

Why Is My Fixed Element Behind a Transformed Parent?

Fix fixed element behind transformed parent bugs by learning why transform can trap fixed modals, drawers, toasts, and floating bars.

Open fix Layering

Why Does filter Create a Stacking Context?

Fix filter creates stacking context bugs by learning why blur, brightness, drop-shadow, and backdrop-filter can trap overlays.

Open fix Layering

Why Does opacity Break Z-index?

Fix opacity break z-index bugs by learning why faded parents create stacking contexts that trap tooltips, dropdowns, modals, and toasts.

Open fix Layering

Why Does transform Break Z-index?

Fix transform break z-index bugs by learning why transformed parents create stacking contexts that trap modals, dropdowns, and tooltips.

Open fix Positioning

Why Does My Sticky Sidebar Stop Too Early?

Fix sticky sidebar stops too early bugs by learning why parent height, scroll boundaries, and tall sidebar content limit sticky CSS.

Open fix CSS Grid

Why Does Sticky Stop Working Inside Grid or Flexbox?

Fix sticky inside grid flex not working bugs by learning why Grid and Flexbox stretch, trap, or limit sticky elements.

Open fix Overflow

Why Does position: sticky Fail Inside overflow:hidden?

Fix position sticky overflow hidden bugs by learning why overflow hidden parents stop sticky elements from sticking inside CSS layouts.

Open fix CSS Grid

Why Does auto-fill Create Phantom Grid Columns?

Fix auto-fill phantom grid columns by learning why CSS Grid reserves empty tracks, gaps, and invisible column space.

Open fix CSS Grid

Why Does auto-fit Leave Empty Grid Space?

Fix auto-fit leaves empty grid space by learning why CSS Grid collapses empty tracks, stretches cards, and creates awkward partial rows.

Open fix Overflow

Why Does minmax(300px, 1fr) Overflow on Mobile?

Fix minmax 300px overflow mobile bugs by learning why CSS Grid tracks with hard minimums can push layouts wider than the screen.

Open fix CSS Grid

Why Does repeat(3, 1fr) Break on Mobile?

Fix grid repeat 3 columns breaks mobile by learning why repeat(3, 1fr) keeps desktop columns active on narrow screens.

Open fix Layout

Why Does align-items:stretch Make Cards Look Wrong?

Fix align-items stretch card layout bugs by learning why Flexbox stretches cards, images, buttons, and side panels to match the tallest item.

Open fix Flexbox

Why Does a Flex Row Refuse to Wrap?

Fix flex row refuses to wrap by learning why nowrap, fixed widths, min-width, flex-basis, and white-space rules keep items on one line.

Open fix Flexbox

Why Does flex-shrink:0 Break Mobile Layouts?

Fix flex-shrink 0 breaks mobile layout by learning why protected cards, buttons, images, sidebars, and chips create horizontal scroll.

Open fix Flexbox

Why Does flex:1 Make Items Too Wide?

Fix flex 1 items too wide by learning why equal flex items overflow when gaps, minimum widths, fixed siblings, or long content are involved.

Open fix Overflow

Why Does CSS Grid Need min-width:0?

CSS Grid min-width 0 fixes overflow when long text, URLs, media, or content-based minimum sizes make grid columns wider than their container.

Open fix Overflow

Why Does Flexbox Need min-width:0?

Flexbox min-width 0 fixes overflow when long text, URLs, buttons, or media inside a flex child refuse to shrink inside the row.

Open fix Overflow

Why Is There Horizontal Scroll Only at One Breakpoint?

Fix horizontal scroll at one breakpoint by finding the media query, grid, flex, width, gap, or fixed element that breaks only in one screen…

Open fix Sizing

Why Does min-width Break Mobile Layouts?

Fix min-width breaks mobile layout by learning why cards, inputs, flex items, and grid tracks refuse to shrink on small screens.

Open fix Sizing

Why Does a Full-Bleed Section Break the Page Width?

Fix full-bleed section breaks page width by separating background layers from content wrappers and preventing horizontal scroll.

Open fix Overflow

Why Does an Offscreen Menu Create Horizontal Scroll?

Fix offscreen menu horizontal scroll by learning why hidden mobile drawers, transforms, negative offsets, and oversized backdrops widen the page.

Open fix Overflow

Why Does an Absolute Element Create Mobile Overflow?

Fix absolute element mobile overflow by learning how positioned badges, menus, shapes, and transforms can make a page wider than the screen.

Open fix Overflow

Why Does a Negative Margin Create Horizontal Scroll?

Fix negative margin horizontal scroll by learning why breakout spacing, shifted cards, overlays, and full-bleed tricks can widen the page.

Open fix Layout

Why Is box-sizing:border-box Not Fixing My Layout?

Fix box-sizing border-box not fixing layout by finding why padding, children, media, fixed widths, or positioned elements still overflow.

Open fix Overflow

Why Does width:100% Overflow After Padding?

Fix width 100% padding overflow by learning how the CSS box model adds padding outside width and when to use box-sizing:border-box.

Open fix Overflow

Why Does overflow-x hidden on body not stop mobile scroll?

Fix body overflow-x hidden not stopping scroll by finding the real CSS overflow source, from html root width to fixed elements and nested containers.

Open fix Overflow

Why Does 100vw Cause Horizontal Scroll?

Fix 100vw causes horizontal scroll bugs by learning why viewport width can make a page wider than the screen and when to use width:100%…

Open fix Interaction

Why Is My Card Hover Effect Jumping?

Fix a card hover effect jumping by debugging border width, padding, margin, height changes, font-size, transform, box-shadow, and layout shifts.

Open fix Fix

Why Is My Footer Floating in the Middle of the Page?

Fix a footer floating in the middle of the page by debugging sticky footer layout, min-height, flex column, main flex growth, absolute positioning, and…

Open fix Fix

Why Is My Section Leaving a Big Blank Space?

Fix a section leaving big blank space by debugging padding, margin, min-height, fixed height, invisible elements, absolute positioning, and flex spacing.

Open fix Media

Why Is My Background Image Not Covering the Full Section?

Fix a background image not covering full section by debugging background-size, section height, wrong wrappers, shorthand resets, repeat, and mobile positioning.

Open fix Media

Why Is My Image Cropped Wrong on Mobile?

Fix an image cropped wrong on mobile by debugging object-fit, object-position, aspect-ratio, fixed height, background-position, and responsive image crops.

Open fix CSS Grid

Why Is My CSS Grid Not Equal Height?

Fix CSS grid not equal height by debugging align-items, height 100%, grid-auto-rows, card content, stretch behavior, and responsive CSS Grid.

Open fix Overflow

Why Is My Grid Column Overflowing?

Fix a grid column overflowing by debugging minmax(0,1fr), min-width, fixed columns, gap, long text, images, and responsive CSS Grid.

Open fix Overflow

Why Is My Flexbox Gap Creating Overflow?

Fix flexbox gap creating overflow by debugging percentage widths, fixed widths, nowrap rows, flex-basis, min-width, and responsive wrapping.

Open fix Forms

Why Is My Label Not Aligned With the Input?

Fix a label not aligned with input by debugging HTML structure, flexbox, grid columns, baseline alignment, line-height, and responsive form CSS.

Open fix Forms

Why Is My Input Placeholder Cut Off?

Fix an input placeholder cut off issue by debugging fixed height, line-height, padding, box-sizing, mobile font size, and form CSS.

Open fix Interaction

Why Is My Button Wider Than the Screen on Mobile?

Fix a button wider than screen on mobile by debugging fixed width, nowrap text, large padding, icons, flex rows, and responsive CSS.

Open fix Dropdown

Why Is My Dropdown Closing When I Move the Mouse?

Fix a dropdown closes when moving mouse issue by removing hover gaps, fixing pointer-events, improving focus-within, z-index, and mobile tap behavior.

Open fix Fix

Why Is My Tooltip Hidden Behind Other Elements?

Fix a tooltip hidden behind elements by debugging overflow hidden, z-index, stacking context, transform, positioning, and wrong parent containers.

Open fix Interaction

Why Is My Modal Behind the Overlay?

Fix a modal behind overlay by debugging z-index, stacking context, transform, position, pointer-events, and wrong HTML structure.

Open fix Positioning

Why Is My Sticky Header Not Staying on Top?

Fix a sticky header not staying on top by checking top, z-index, parent overflow, scroll containers, stacking context, and responsive CSS.

Open fix Layout

Why Is My Logo Not Centered in the Header?

Fix a logo not centered in header by debugging uneven nav items, CTA buttons, flexbox spacing, absolute positioning, mobile icons, and responsive header CSS.

Open fix Fix

Why Is My Navbar Wrapping to Two Lines?

Fix a navbar wrapping to two lines because of logo size, flexbox, gap, fixed widths, nowrap, CTA buttons, or responsive breakpoints.

Open fix Responsive

Why Is My Mobile Menu Not Opening?

Fix a mobile menu not opening because of wrong HTML structure, class mismatch, hidden CSS rules, pointer-events, z-index, or responsive breakpoints.

Open fix Responsive

Why Is My Website Zoomed Out on Mobile?

Fix a website zoomed out on mobile by checking the viewport meta tag, fixed widths, desktop containers, overflow, and responsive CSS.

Open fix Fix

Why Is My Page Wider Than the Screen?

Fix a page wider than screen issue caused by 100vw bugs, fixed widths, images, grids, flex gaps, absolute elements, and mobile overflow.

Open fix Responsive

Why Is My Element Centered on Desktop but Off on Mobile?

Element centered on desktop but off on mobile? Learn how to fix alignment issues caused by fixed widths, manual margins, transforms, parent layout, and…

Open fix Fix

Why Is My Sidebar Dropping Below the Content?

Sidebar dropping below content? Learn how to fix CSS layout issues caused by rigid columns, grid tracks, flex behavior, wide children, and responsive breakpoints.

Open fix Media

Why Is My Image Leaving Empty Space Around It?

Image leaving empty space around it? Learn how to fix image gaps caused by inline display, padding, margins, aspect ratio, object-fit, and wrapper spacing.

Open fix Typography

Why Is My Font Size Different on Mobile?

Font size different on mobile? Learn how to fix mobile typography issues caused by rigid desktop sizes, viewport units, media queries, em units, and…

Open fix Fix

Why Is My CSS Class Not Applying?

CSS class not applying? Learn how to fix class name mismatches, missing selector dots, specificity conflicts, unloaded stylesheets, cache, and CSS order issues.

Open fix Interaction

Why Is My Button Text Wrapping Weirdly?

Button text wrapping weirdly? Learn how to fix awkward CTA line breaks caused by fixed widths, white-space, icons, padding, and responsive button groups.

Open fix Forms

Why Is My Form Input Wider Than Its Container?

Form input wider than its container? Learn how to fix input overflow caused by width, padding, box-sizing, fixed widths, flex rows, and mobile form…

Open fix Fix

Why Is My CSS Animation Not Playing?

CSS animation not playing? Learn how to fix keyframes name mismatches, missing duration, wrong selectors, fill-mode issues, and invisible animation states.

Open fix Fix

Why Is My CSS Transition Not Working?

CSS transition not working? Learn why transitions fail because of wrong selectors, non-animatable properties, missing start values, display none, or overridden CSS.

Open fix Fix

Why Is My CSS Not Updating After I Change It?

CSS not updating after you change it? Learn why CSS changes may not show because of cache, specificity, file order, minification, or the wrong…

Open fix Positioning

Why Is My Absolute Positioned Element in the Wrong Place?

Fix an absolute positioned element in the wrong place by setting the correct relative parent, inset values, transforms, and layout structure.

Open fix Sizing

Why Does My Layout Shift by 1px at Certain Screen Widths?

Fix a layout shift by 1px in CSS caused by 100vw, scrollbars, subpixel rounding, flex, grid, padding, borders, and responsive screen widths.

Open fix Overflow

Why Is My Text Overflowing Outside the Box in CSS?

Text overflowing outside the box in CSS? Learn how to fix long URLs, nowrap text, Flexbox min-width issues, Grid overflow, and mobile layout breaks.

Open fix Flexbox

Why Is My Flex Item Shrinking Even With a Fixed Width?

Is your flex item shrinking even with a fixed width? Learn why Flexbox compresses items and how to fix it with flex-shrink: 0, flex:…

Open fix Media

Gap Under Image CSS? Fix the Invisible Layout Space

Gap under image in CSS? Learn why images leave invisible baseline space, how display:block fixes it, and when to use vertical-align for inline images.

Open fix Dropdown

Why Is My Dropdown Getting Cut Off?

Dropdown getting cut off even with z-index? Learn how overflow hidden, stacking contexts, clipped parents, and wrong positioning can hide your menu.

Open fix Layout

Why Is My Fixed Header Covering Content?

Fixed header covering content? Fix hidden titles, anchor links, mobile header height, scroll-margin-top, and sticky vs fixed header layout bugs.

Open fix Responsive

Why Is My Media Query Not Working?

Media query not working on mobile? Learn how missing viewport tags, invalid syntax, CSS order, specificity, cache, and rigid layouts break responsive CSS.

Open fix HTML

Fix HTML structure problems

Meta description: HTML structure problems can make CSS look broken. Learn how wrong nesting, missing wrappers, weak components, and bad markup quietly break layouts.

Open fix Containers

Fix container width problems

Container width problems can make layouts look too wide, cramped, misaligned, or broken on mobile. Learn how to fix wrappers, max-width, and padding.

Open fix

CSS Fixes Layout, overflow, Grid, Flexbox, sizing, positioning, layering, and styling problems. HTML Fixes Markup and structure problems that affect layout, accessibility, interaction, and stability. Responsive Design Mobile, tablet, breakpoint, wrapping, sizing, and adaptive layout problems. See the Difference Compare weaker implementations with cleaner, production-ready approaches.

How to use the FrontFixer library

Start with the problem you can describe most clearly. Choose the closest guide, compare the broken behavior with the corrected approach, and check the surrounding layout before applying a change.

New fixes are automatically added to this library when they are published. The strongest general debugging guides remain easier to find at the top, while the full archive stays available below them.