html {
    margin: 0;
  }
  
  span {
    display: block;
  }

  .canvas {
    margin: 100px auto 100px;
    width: 80%;
    text-align: center;
  }
  
  .button {
    width: 100px;
    height: 100px;
    border-left: solid red 2px;
    border-radius: 20px;
    padding-left: 10px;
    display: inline-block;
    margin-left: 10px;
  }
  
  #grey {
    background: grey;
    /* background-color: black; */
    color: black;
  }
  
  #white {
    background: white;
  }
  #blue {
    background: blue;
  }
  #yellow {
    background: yellow;
  }
  #purple{
    background: purple;
  }

  #foo{

    font-weight: 100;
    color: darkgray;
    /* background-color: black; */
  }
  #header{
    padding-top: 20px;
     justify-content: center;

      text-align: center;
  }