pigallery2/frontend/app/gallery/lightbox/inputrange.css

input[type="range"] {
  margin: auto;
  -webkit-appearance: none;
  position: relative;
  overflow: hidden;
  height: 8px;
  cursor: pointer;
  border-radius: 0; /* iOS */
}

input[type="range"]::-webkit-slider-runnable-track {
  background: #6c757d;
}

/*
 * 1. Set to 0 width and remove border for a slider without a thumb
 */
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1px; /* 1 */
  height: 10px;
  background: #fff;
  box-shadow: -100vw 0 0 100vw white;
}

input[type="range"]::-moz-range-track {
  height: 8px;
  background: #6c757d;
}

input[type="range"]::-moz-range-thumb {
  background: #fff;
  height: 10px;
  width: 1px;
  box-shadow: -100vw 0 0 100vw white;
  box-sizing: border-box;
}

input[type="range"]::-ms-fill-lower {
  background: white;
}

input[type="range"]::-ms-thumb {
  background: #fff;
  height: 10px;
  width: 1px;
  box-sizing: border-box;
}

input[type="range"]::-ms-ticks-after {
  display: none;
}

input[type="range"]::-ms-ticks-before {
  display: none;
}

input[type="range"]::-ms-track {
  background: #6c757d;
  color: transparent;
  height: 8px;
  border: none;
}

input[type="range"]::-ms-tooltip {
  display: none;
}