Accordion with Smooth Animation

An accordion with smooth animation built using pure HTML and CSS that expands and collapses content panels with fluid motion. It enhances interaction continuity and visual flow while keeping the structure lightweight.

Usage

Use this component when interfaces require visually polished expandable sections, such as FAQs, documentation blocks, onboarding steps, or content breakdowns that benefit from seamless transitions.

Implementation

The animation is handled using CSS transition based height or max height control, combined with easing functions for smoother expansion and collapse behavior. Responsive styling ensures consistent motion across screen sizes.

HTML

<div class="ss-accordion">
  <details>
    <summary>Smooth Accordion</summary>
    <p>Animated accordion content.</p>
  </details>
</div>

<div class="ss-accordion">
  <details>
    <summary>Smooth Accordion</summary>
    <p>Animated accordion content.</p>
  </details>
</div>

CSS

.ss-accordion details{
  transition:.3s;
}

.ss-accordion details[open] p{
  animation:fade .3s ease;
}

@keyframes fade{
  from{ opacity:0; }
  to{ opacity:1; }
}

.ss-accordion details{
  transition:.3s;
}

.ss-accordion details[open] p{
  animation:fade .3s ease;
}

@keyframes fade{
  from{ opacity:0; }
  to{ opacity:1; }
}

Notes

• Built with pure HTML and CSS
• No JavaScript required
• Features fluid transition based expansion
• Enhances visual motion consistency
• Fully responsive across breakpoints
• Suitable for FAQs and documentation layouts
• Easy to customize animation speed and easing

Preview styles shown. Production customization recommended.

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