style.css

body {
    background-color: #000;
    background-image: url("https://www.transparenttextures.com/patterns/3px-tile.png");
    font-family: 'Kelly Slab', cursive;
    margin-top: 40px;
  }
  
  h1 {
    font-size: 40px;
    line-height: 0px;
  }
  
  .title,
  .byline {
    color: white;
    text-align: center;
    font-family: 'Bungee Shade', cursive;
  }
  
  button {
    width: 56px;
    height: 20px;
    background-color: rgba(255, 0, 0, 0.76);
    border: 0px;
    color: white;
    text-align: center;
  }
  
  .wrapper {
    overflow: hidden;
  }
  
  .circle {
    width: 300px;
    height: 300px;
    border-radius: 100%;
    position: relative;
    text-align: center;
    margin: auto;
    background-color: #333;
    border: 12px solid #232323;
  }
  
  .half {
    height: 50%;
    padding-bottom: 2%;
  }
  
  .sector {
    height: 96%;
    width: 48%;
  }
  
  .topleft {
    border-top-left-radius: 100%;
    float: left;
  }
  
  .topright {
    border-top-right-radius: 100%;
    float: right;
  }
  
  .bottomleft {
    border-bottom-left-radius: 100%;
    float: left;
  }
  
  .bottomright {
    border-bottom-right-radius: 100%;
    float: right;
  }
  
  .red {
    background-color: rgba(255, 0, 0, 0.76);
  }
  
  .green {
    background-color: rgba(0, 128, 0, 0.76);
  }
  
  .blue {
    background-color: rgba(0, 0, 255, 0.76);
  }
  
  .yellow {
    background-color: rgba(255, 255, 0, 0.76);
  }
  
  .game-control {
    width: 150px;
    height: 150px;
    position: absolute;
    border-radius: 100%;
    top: 50%;
    left: 50%;
    margin: -87px 0 0 -87px;
    background-color: #ECE7EE;
    border: 12px solid #333;
  }
  
  .lighten {
    box-shadow: inset 0 0 100px 100px rgba(255, 255, 255, 0.3);
  }