style.css

/* CSS (style.css) */
html {
  height: 100%;
}

body {
  background: black;
}
input {
  font-size: 16px;
}

/* sliders */
input[type=range] {
    width: 100%;
    margin: 8px 0;
    background-color: transparent;
    -webkit-appearance: none;
  }
  input[type=range]:focus {
    outline: none;
  }
  input[type=range]::-webkit-slider-runnable-track {
    background: rgba(179, 0, 31, 0.1);
    border: 0.2px solid #ff0000;
    width: 100%;
    height: 0px;
    cursor: pointer;
  }
  input[type=range]::-webkit-slider-thumb {
    margin-top: -8.2px;
    width: 16px;
    height: 16px;
    background: #ffffff;
    border: 1px solid #000000;
    border-radius: 1px;
    cursor: pointer;
    -webkit-appearance: none;
  }
  input[type=range]:focus::-webkit-slider-runnable-track {
    background: #dc0026;
  }
  input[type=range]::-moz-range-track {
    background: rgba(179, 0, 31, 0.1);
    border: 0.2px solid #ff0000;
    width: 100%;
    height: 0px;
    cursor: pointer;
  }
  input[type=range]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: #ffffff;
    border: 1px solid #000000;
    border-radius: 1px;
    cursor: pointer;
  }
  input[type=range]::-ms-track {
    background: transparent;
    border-color: transparent;
    border-width: 9px 0;
    color: transparent;
    width: 100%;
    height: 0px;
    cursor: pointer;
  }
  input[type=range]::-ms-fill-lower {
    background: #8a0018;
    border: 0.2px solid #ff0000;
  }
  input[type=range]::-ms-fill-upper {
    background: rgba(179, 0, 31, 0.1);
    border: 0.2px solid #ff0000;
  }
  input[type=range]::-ms-thumb {
    width: 16px;
    height: 16px;
    background: #ffffff;
    border: 1px solid #000000;
    border-radius: 1px;
    cursor: pointer;
    margin-top: 0px;
  }
  input[type=range]:focus::-ms-fill-lower {
    background: rgba(179, 0, 31, 0.1);
  }
  input[type=range]:focus::-ms-fill-upper {
    background: #dc0026;
  }
  
  @supports (-ms-ime-align:auto) {
    input[type=range] {
      margin: 0;
    }
  }