How to Build Animated CSS Components Without JavaScript

Modern CSS can handle many interactive patterns that previously required JavaScript. Here are production-ready animated components.

1. Animated Accordion

<details class="accordion">
  <summary>How does billing work?</summary>
  <div class="accordion-content">
    <p>We bill monthly based on your plan. You can upgrade or downgrade at any time.</p>
  </div>
</details>

.accordion {
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  overflow: hidden;
}

.accordion summary {
  padding: 1rem;
  cursor: pointer;
  font-weight: 500;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion summary::after {
  content: "+";
  font-size: 1.25rem;
  transition: transform 0.2s ease;
}

.accordion[open] summary::after {
  transform: rotate(45deg);
}

.accordion-content {
  padding: 0 1rem 1rem;
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-0.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

2. CSS-Only Modal with :target

<a href="#modal">Open Modal</a>

<div id="modal" class="modal-backdrop">
  <div class="modal">
    <h2>Modal Title</h2>
    <p>This modal is built with pure CSS using the :target pseudo-class.</p>
    <a href="#" class="modal-close">Close</a>
  </div>
</div>

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / 0);
  display: grid;
  place-items: center;
  pointer-events: none;
  transition: background 0.3s ease;
  z-index: 50;
}

.modal-backdrop:target {
  background: rgb(0 0 0 / 0.5);
  pointer-events: auto;
}

.modal {
  background: white;
  border-radius: 0.75rem;
  padding: 2rem;
  max-width: 28rem;
  width: 90%;
  transform: scale(0.95) translateY(1rem);
  opacity: 0;
  transition: all 0.3s ease;
}

.modal-backdrop:target .modal {
  transform: scale(1) translateY(0);
  opacity: 1;
}

.modal-close {
  display: inline-block;
  margin-top: 1rem;
  color: #6b7280;
  text-decoration: none;
}

3. Animated Tooltip

<span class="tooltip-wrapper">
  Hover me
  <span class="tooltip">This is a tooltip</span>
</span>

.tooltip-wrapper {
  position: relative;
  cursor: help;
}

.tooltip {
  position: absolute;
  bottom: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%) translateY(0.25rem);
  background: #1f2937;
  color: white;
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all 0.2s ease;
}

.tooltip::after {
  content: "";
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 4px solid transparent;
  border-top-color: #1f2937;
}

.tooltip-wrapper:hover .tooltip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

4. Animated Tab Navigation

<div class="tabs">
  <input type="radio" name="tab" id="tab1" checked />
  <input type="radio" name="tab" id="tab2" />
  <input type="radio" name="tab" id="tab3" />

  <nav class="tab-nav">
    <label for="tab1">Overview</label>
    <label for="tab2">Features</label>
    <label for="tab3">Pricing</label>
    <div class="tab-indicator"></div>
  </nav>

  <div class="tab-panels">
    <div class="tab-panel">Overview content here.</div>
    <div class="tab-panel">Features content here.</div>
    <div class="tab-panel">Pricing content here.</div>
  </div>
</div>

.tabs {
  width: 100%;
}

.tabs input[type="radio"] {
  display: none;
}

.tab-nav {
  display: flex;
  position: relative;
  border-bottom: 2px solid #e5e7eb;
}

.tab-nav label {
  flex: 1;
  padding: 0.75rem;
  text-align: center;
  cursor: pointer;
  font-weight: 500;
  color: #6b7280;
  transition: color 0.2s;
}

.tab-indicator {
  position: absolute;
  bottom: -2px;
  height: 2px;
  width: calc(100% / 3);
  background: #2563eb;
  transition: transform 0.3s ease;
}

#tab1:checked ~ .tab-nav .tab-indicator { transform: translateX(0); }
#tab2:checked ~ .tab-nav .tab-indicator { transform: translateX(100%); }
#tab3:checked ~ .tab-nav .tab-indicator { transform: translateX(200%); }

#tab1:checked ~ .tab-nav label[for="tab1"],
#tab2:checked ~ .tab-nav label[for="tab2"],
#tab3:checked ~ .tab-nav label[for="tab3"] {
  color: #2563eb;
}

.tab-panels {
  overflow: hidden;
}

.tab-panel {
  display: none;
  padding: 1.5rem 0;
  animation: fadeIn 0.3s ease;
}

#tab1:checked ~ .tab-panels .tab-panel:nth-child(1),
#tab2:checked ~ .tab-panels .tab-panel:nth-child(2),
#tab3:checked ~ .tab-panels .tab-panel:nth-child(3) {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(0.5rem); }
  to { opacity: 1; transform: translateY(0); }
}

5. Staggered List Animation

.stagger-list li {
  opacity: 0;
  transform: translateY(1rem);
  animation: slideUp 0.4s ease forwards;
}

.stagger-list li:nth-child(1) { animation-delay: 0s; }
.stagger-list li:nth-child(2) { animation-delay: 0.05s; }
.stagger-list li:nth-child(3) { animation-delay: 0.1s; }
.stagger-list li:nth-child(4) { animation-delay: 0.15s; }
.stagger-list li:nth-child(5) { animation-delay: 0.2s; }
.stagger-list li:nth-child(6) { animation-delay: 0.25s; }

@keyframes slideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

6. Scroll-Driven Progress Bar

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: #2563eb;
  transform-origin: left;
  animation: scaleProgress auto linear;
  animation-timeline: scroll();
}

@keyframes scaleProgress {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

7. Animated Gradient Border

.gradient-border {
  position: relative;
  border-radius: 0.75rem;
  padding: 2px;
  background: linear-gradient(
    var(--angle, 0deg),
    #3b82f6,
    #8b5cf6,
    #ec4899,
    #3b82f6
  );
  animation: rotate 3s linear infinite;
}

.gradient-border > * {
  background: white;
  border-radius: calc(0.75rem - 2px);
  padding: 1.5rem;
}

@property --angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

@keyframes rotate {
  to { --angle: 360deg; }
}

8. Animated Card Hover

.card-hover {
  border: 1px solid #e5e7eb;
  border-radius: 0.75rem;
  padding: 1.5rem;
  transition: all 0.3s ease;
  cursor: pointer;
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px -8px rgb(0 0 0 / 0.1);
  border-color: #3b82f6;
}

.card-hover h3 {
  transition: color 0.2s ease;
}

.card-hover:hover h3 {
  color: #2563eb;
}

9. Loading Skeleton

.skeleton {
  background: linear-gradient(
    90deg,
    #f3f4f6 25%,
    #e5e7eb 50%,
    #f3f4f6 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 0.375rem;
}

.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-avatar {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

10. View Transition for Page Navigation

@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: fadeOut 0.2s ease;
}

::view-transition-new(root) {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeOut {
  to { opacity: 0; }
}

@keyframes fadeIn {
  from { opacity: 0; }
}

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