* {
    box-sizing: border-box;
  }
  
  body {
    background: blue;
    margin: 0;
    padding: 0;
  }
  
  canvas {
    display: block;
  }


.slider {
    position: fixed;
    top: 18px;
    left: 0;
    right: 0;
    width: 50%;
    margin: 0 auto;
    -webkit-appearance: none; 
    appearance: none;
    height: 6px;
    border-radius: 1em;
    border: 1px solid black;
    background: lightgrey;
    outline: none; 
}
   
/* The grippy thumb bit. Still need prefixes for Firefox and Chrome */
.slider::-webkit-slider-thumb {
    -webkit-appearance: none; 
    appearance: none;
    width: 24px; 
    height: 24px; 
    border-radius: 50%; 
    background: black; 
    cursor: pointer;
    border: none;  
}
.slider::-moz-range-thumb {
    appearance: none;
    width: 24px; 
    height: 24px; 
    border-radius: 50%;
    background: black;
    cursor: pointer;
    border: none;
}


button {
    position: fixed;
    bottom: 12px;
    left: 0;
    right: 0;
    width: 120px; 
    height: 24px; 
    margin: 0 auto;
    outline: none;
    border: none;
    font-size: 10px;
    line-height: 1;
    border-radius: 1em;
    cursor: pointer;
    background: lightgrey;
    transition: all 300ms;
}
button:hover {
    background: black;
    color: lightgrey;
}


.wow {
    font-size: 48px;
    font-family: sans-serif;
    pointer-events: none;
  }