CSS Tricks That Save Me Hours Every Week

These aren't the flashy animations you see on CodePen. These are practical tricks I use in real projects.

1. Truncate Text with Ellipsis

/* Single line */
.truncate {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Multi-line (works everywhere now!) */
.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Use case: Product descriptions, news previews, card titles */
.product-title {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  max-height: 3.5em; /* ~2 lines */
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
}

2. Modern Centering

/* ❌ Old way */
.center-old {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* ✅ Flexbox (most common) */
.center-flex {
  display: flex;
  justify-content: center; /* horizontal */
  align-items: center;     /* vertical */
  min-height: 100vh;
}

/* ✅ Grid (cleanest syntax) */
.center-grid {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

/* ✅ Flexbox margin trick (for single item) */
.parent {
  display: flex;
}
.child {
  margin: auto; /* Centers in both directions! */
}

3. Sticky Header/Footer

/* No JavaScript needed! */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: white; /* Prevents content showing through */
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.sticky-footer {
  position: sticky;
  bottom: 0;
  background: white;
  padding: 1rem;
  border-top: 1px solid #eee;
}

/* Sidebar that stays visible while scrolling */
.sidebar {
  position: sticky;
  top: 80px; /* Below sticky header */
  height: calc(100vh - 80px);
  overflow-y: auto;
}

4. Responsive Typography

/* Instead of media queries for every breakpoint: */
html {
  font-size: clamp(14px, 2vw + 10px, 20px);
}

/* Scales between 14px (small screens) and 20px (large screens) */
/* Automatically responsive — no breakpoints needed! */

/* For headings with even more control: */
h1 {
  font-size: clamp(1.5rem, 5vw + 1rem, 4rem);
  line-height: 1.1;
}

p {
  font-size: clamp(1rem, 1.5vw + 0.5rem, 1.125rem);
  max-width: 70ch; /* Optimal reading length (~70 characters) */
}

5. Custom Scrollbar

/* Make scrollbars match your design */
.custom-scrollbar::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.custom-scrollbar::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

.custom-scrollbar::-webkit-scrollbar-thumb {
  background: #c1c1c1;
  border-radius: 4px;
}

.custom-scrollbar::-webkit-scrollbar-thumb:hover {
  background: #a1a1a1;
}

/* Firefox */
.custom-scrollbar {
  scrollbar-width: thin;
  scrollbar-color: #c1c1c1 #f1f1f1;
}

6. Smooth Scrolling & Scroll Snapping

/* Smooth scrolling for anchor links */
html {
  scroll-behavior: smooth;
}

/* Snap to sections (like a presentation) */
.snap-container {
  scroll-snap-type: y mandatory;
  overflow-y: scroll;
  height: 100vh;
}

.snap-section {
  scroll-snap-align: start;
  height: 100vh;
}

/* Card carousel snapping */
.card-carousel {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  gap: 1rem;
  padding: 1rem 0;
}

.card-carousel > * {
  scroll-snap-align: center;
  flex-shrink: 0;
  width: 300px;
}

7. Selection & Focus Styles

/* Brand your text selection */
::selection {
  background: #3b82f6; /* Your brand color */
  color: white;
}

/* Better focus styles for accessibility */
:focus-visible {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

/* Remove default focus for mouse users, keep for keyboard */
:focus:not(:focus-visible) {
  outline: none;
}

8. Container Queries (Game Changer!)

/* Media queries respond to VIEWPORT size */
/* Container queries respond to PARENT size! */

/* Define container */
.card-container {
  container-type: inline-size;
  container-name: card;
}

/* Child responds to parent's width, not viewport! */
@container card (min-width: 400px) {
  .card-inner {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 1rem;
  }
}

@container card (max-width: 399px) {
  .card-inner {
    display: flex;
    flex-direction: column;
  }
}

/* This means reusable components that adapt to their container! */
/* No more wrapper classes like .card-large, .card-small */

9. Aspect Ratio Made Easy

/* Before: padding-bottom hack (ugly) */
.aspect-old {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 = 9/16 * 100% */
}
.aspect-old > * {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
}

/* After: one property! */
.aspect-modern {
  aspect-ratio: 16 / 9;
}

/* Common ratios */
.video { aspect-ratio: 16 / 9; }
.square { aspect-ratio: 1 / 1; }
.photo { aspect-ratio: 4 / 3; }
.story { aspect-ratio: 9 / 16; } /* Instagram story */

10. The :has() Selector (CSS "Parent Select")

/* Finally select a parent based on its children! */

/* Card has an image → use grid layout */
.card:has(.card-image) {
  display: grid;
  grid-template-columns: 200px 1fr;
}

/* Card has no image → simple block layout */
.card:not(:has(.card-image)) {
  padding: 1rem;
}

/* Form field has error → red border */
.form-field:has(.error-message) {
  border-color: #ef4444;
}

/* Navigation has dropdown → show arrow */
.nav-item:has(.dropdown)::after {
  content: '▼';
  margin-left: 4px;
  font-size: 0.75rem;
}

/* Empty state styling */
.list-container:has(:empty)::after {
  content: 'No items yet';
  display: block;
  text-align: center;
  color: #999;
  padding: 2rem;
}

Quick Reference Card

Trick	Property	Browser Support
Text truncate	text-overflow	All
Centering	flex / grid	All
Sticky positioning	position: sticky	All
Responsive fonts	clamp()	All
Container queries	container-type	All modern
Aspect ratio	aspect-ratio	All modern
Parent selector	:has()	All modern
Scroll snap	scroll-snap-type	All
View transitions	view-transition-name	Chrome/Edge

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What's your favorite CSS trick? Share it in the comments!

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