stash/ui/v2.5/src/styles/_range.scss

input[type="range"] {
  -webkit-appearance: none;
  background-color: transparent;
  border-color: transparent;
  height: 22px;
  margin: 10px 0;

  &:focus {
    background-color: transparent;
    border: inherit;
    border-color: transparent;
    box-shadow: none;
    outline: none;
  }

  &::-webkit-slider-runnable-track {
    animate: 0.2s;
    background: $primary;
    border: 0 solid #000101;
    border-radius: 25px;
    box-shadow: 0 0 0 #000;
    cursor: pointer;
    height: 6px;
    width: 100%;
  }

  &::-webkit-slider-thumb {
    -webkit-appearance: none;
    background: #394b59;
    border: 0 solid #000;
    border-radius: 10px;
    box-shadow: 0 0 0 #000;
    cursor: pointer;
    height: 15px;
    margin-top: -4px;
    width: 15px;
  }

  &:focus::-webkit-slider-runnable-track {
    background: #137cbd;
  }

  &::-moz-range-track {
    animate: 0.2s;
    background: $primary;
    border: 0 solid #000101;
    border-radius: 25px;
    box-shadow: 0 0 0 #000;
    cursor: pointer;
    height: 6px;
    width: 100%;
  }

  &::-moz-range-thumb {
    background: #394b59;
    border: 0 solid #000;
    border-radius: 10px;
    box-shadow: 0 0 0 #000;
    cursor: pointer;
    height: 15px;
    width: 15px;
  }

  &::-ms-track {
    animate: 0.2s;
    background: transparent;
    border-color: transparent;
    color: transparent;
    cursor: pointer;
    height: 6px;
    width: 100%;
  }

  &::-ms-fill-lower {
    background: $primary;
    border: 0 solid #000101;
    border-radius: 50px;
    box-shadow: 0 0 0 #000;
  }

  &::-ms-fill-upper {
    background: $primary;
    border: 0 solid #000101;
    border-radius: 50px;
    box-shadow: 0 0 0 #000;
  }

  &::-ms-thumb {
    background: #394b59;
    border: 0 solid #000;
    border-radius: 10px;
    box-shadow: 0 0 0 #000;
    cursor: pointer;
    height: 16px;
    margin-top: 2px;
    width: 16px;
  }

  &:focus::-ms-fill-lower {
    background: #137cbd;
  }

  &:focus::-ms-fill-upper {
    background: #137cbd;
  }
}