Radio Button Fill Animation

A radio button fill animation built with pure HTML and CSS that smoothly fills the inner selection dot when the option is chosen. It enhances selection feedback and interaction clarity within modern form controls.

Usage

Use this component when interfaces require animated radio selection feedback, such as surveys, preference selectors, feature options, or settings panels where a clear active state is important.

Implementation

The effect is implemented using CSS :checked selectors combined with transform and scale transitions, allowing the inner radio indicator to smoothly expand and fill when selected.

HTML

<label class="ss-radio">
  <input type="radio" name="r">
  <span></span>
  Option
</label>

<label class="ss-radio">
  <input type="radio" name="r">
  <span></span>
  Option
</label>

CSS

.ss-radio{
  display:flex;
  align-items:center;
  gap:10px;
}

.ss-radio input{
  display:none;
}

.ss-radio span{
  width:18px;
  height:18px;
  border:2px solid #2563eb;
  border-radius:50%;
  position:relative;
}

.ss-radio input:checked + span::after{
  content:'';
  position:absolute;
  inset:4px;
  background:#2563eb;
  border-radius:50%;
}

.ss-radio{
  display:flex;
  align-items:center;
  gap:10px;
}

.ss-radio input{
  display:none;
}

.ss-radio span{
  width:18px;
  height:18px;
  border:2px solid #2563eb;
  border-radius:50%;
  position:relative;
}

.ss-radio input:checked + span::after{
  content:'';
  position:absolute;
  inset:4px;
  background:#2563eb;
  border-radius:50%;
}

Notes

• Built with pure HTML and CSS
• No JavaScript required
• Uses fill style scale animation
• Enhances radio selection visibility
• Fully responsive across breakpoints
• Suitable for forms and option selectors
• Easy to customize fill color and animation timing

Preview styles shown. Production customization recommended.

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