Radio Button Fill Animation

This animated radio button fills smoothly when selected, improving visual feedback in forms.

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

• Clean radio animation
• Accessible structure
• Lightweight CSS
• Ideal for forms

Preview styles shown. Production customization recommended.

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