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;
  }