Styling Range Sliders

<input type="range"> renders a thumb (the draggable handle) sitting on a track (the line it slides along). There is no single, universally supported way to style either part yet — each browser engine exposes its own vendor-prefixed pseudo-elements, so a slider that looks intentional across Chrome, Firefox, and Safari needs several parallel rule sets.

Warning

Range slider styling is one of the last corners of CSS without a unified standard pseudo-element. You must write separate, vendor-prefixed rules per engine — ::-webkit-slider-thumb and ::-webkit-slider-runnable-track for Chromium/Safari, ::-moz-range-thumb and ::-moz-range-track for Firefox. Skipping one engine means the slider falls back to that browser's default look, which can look inconsistent next to your custom styling.

Styling the track

CSS

input[type="range"] {
  -webkit-appearance: none; /* required to unlock custom track/thumb styling in WebKit/Blink */
  appearance: none;
  width: 100%;
  background: transparent;
}

/* Chromium & Safari */
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: #d9d9d9;
}

/* Firefox */
input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: #d9d9d9;
}

Styling the thumb

CSS

/* Chromium & Safari */
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -7px; /* vertically centers thumb on a 6px track */
  border-radius: 50%;
  background: #2a6df4;
  border: 2px solid white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  cursor: pointer;
}

/* Firefox */
input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #2a6df4;
  border: 2px solid white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  cursor: pointer;
}

Worked example: a complete custom slider

CSS

<input type="range" class="slider" min="0" max="100" value="40" />

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(to right, #2a6df4 0%, #2a6df4 40%, #d9d9d9 40%, #d9d9d9 100%);
  outline-offset: 4px; /* keep the focus ring visible and clear of the track */
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: white;
  border: 3px solid #2a6df4;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  transition: transform 0.15s ease;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.slider::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: #d9d9d9;
}

.slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: white;
  border: 3px solid #2a6df4;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  cursor: pointer;
}

/* Always keep a visible focus indicator for keyboard users */
.slider:focus-visible::-webkit-slider-thumb {
  outline: 2px solid #2a6df4;
  outline-offset: 2px;
}

The simpler option: accent-color

If all you need is to recolor a range input to match your brand — without building fully custom thumb and track shapes — the accent-color property does that in a single declaration, and it works across checkboxes, radios, and progress bars too, not just sliders.

CSS

input[type="range"] {
  accent-color: #2a6df4;
  /* Recolors the filled track and thumb using the browser's native
     rendering — no vendor prefixes, no pseudo-elements, no thumb-size
     math required. */
}

Note

`accent-color` is the pragmatic choice when you just want the slider to feel "on brand" rather than fully redesigned. It's a single, unprefixed, well-supported property — reach for the vendor-prefixed pseudo-element approach above only when you need a genuinely custom thumb shape, track gradient, or size that accent-color can't express.

See how far the same idea goes on checkboxes and radios with accent-color, or continue exploring form styling with [appearance property](/css/appearance-property) and [Form Validation Styles](/css/form-validation-styles).