<!-- currently works properly in Chrome only, JS fallback required for IE/FF -->
<h1>CSS Range Slider</h1>
<h3>JS used for color-change and % label</h3>
<input type="range" value="0">
<div id="h4-container"><div id="h4-subcontainer"><h4>0<span></span></h4></div></div>

html {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Work Sans', sans-serif;
  text-align: center;
  h1, h2, h3, h4, h5, h6 {
    margin: 0;
  }
  h1 {
    color: #333;
    font-weight: 500;
  }
  h3 {
    color: #aaa;
    font-weight: 500;
  }
  h4 {
    color: #999;
    font-weight: 500;
    &:after {
      content: "%";
      padding-left: 1px;
    }
  }
  // now for the good stuff 🎉
  input[type="range"] {
    outline: 0;
    border: 0;
    border-radius: 500px;
    width: 400px;
    max-width: 100%;
    margin: 24px 0 16px;
    transition: box-shadow 0.2s ease-in-out;
    // Chrome
    @media screen and (-webkit-min-device-pixel-ratio:0) {
      & {
        overflow: hidden;
        height: 40px;
        -webkit-appearance: none;
        background-color: #ddd;
      }
      &::-webkit-slider-runnable-track {
        height: 40px;
        -webkit-appearance: none;
        color: #444;
        // margin-top: -1px;
        transition: box-shadow 0.2s ease-in-out;
      }
      &::-webkit-slider-thumb {
        width: 40px;
        -webkit-appearance: none;
        height: 40px;
        cursor: ew-resize;
        background: #fff;
        box-shadow: -340px 0 0 320px #1597ff, inset 0 0 0 40px #1597ff;
        border-radius: 50%;
        transition: box-shadow 0.2s ease-in-out;
        position: relative;
        // top: 1px;
      }
      &:active::-webkit-slider-thumb {
        background: #fff;
        box-shadow: -340px 0 0 320px #1597ff, inset 0 0 0 3px #1597ff;
      }
    }
    // Firefox
    &::-moz-range-progress {
      background-color: #43e5f7; 
    }
    &::-moz-range-track {  
      background-color: #9a905d;
    }
    // IE
    &::-ms-fill-lower {
      background-color: #43e5f7; 
    }
    &::-ms-fill-upper {  
      background-color: #9a905d;
    }
  }
}
#h4-container {
  width: 400px;
  max-width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
  position: relative;
  #h4-subcontainer {
    width: 100%;
    position: relative;
    h4 {
      display: flex;
      align-items: center;
      justify-content: center;
      position: absolute;
      top: 0;
      width: 40px;
      height: 40px;
      color: #fff !important;
      font-size: 12px;
      transform-origin: center -10px;
      transform: translateX(-50%);
      transition: margin-top 0.15s ease-in-out,
        opacity 0.15s ease-in-out;
      span {
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
        background-color: #1597ff;
        border-radius: 0 50% 50% 50%;
        transform: rotate(45deg);
        z-index: -1;
      }
    }
  }
}
input:not(:active) + #h4-container h4 {
  opacity: 0;
  margin-top: -50px;
  pointer-events: none;
}

$(function() {
  var rangePercent = $('[type="range"]').val();
  $('[type="range"]').on('change input', function() {
    rangePercent = $('[type="range"]').val();
    $('h4').html(rangePercent+'<span></span>');
    $('[type="range"], h4>span').css('filter', 'hue-rotate(-' + rangePercent + 'deg)');
    // $('h4').css({'transform': 'translateX(calc(-50% - 20px)) scale(' + (1+(rangePercent/100)) + ')', 'left': rangePercent+'%'});
    $('h4').css({'transform': 'translateX(-50%) scale(' + (1+(rangePercent/100)) + ')', 'left': rangePercent+'%'});
  });
});