html, body {
    height: 100%;
    overflow: hidden;
    background: lightslategray;
    margin: 0;
    padding: 0;
  }
  #score {
      display: inline-block;
  }
  nav {
      display: flex;
      justify-content: space-around;
  }
  h1 {
    text-align: center;
    font-family: monospace;
  }
  main {
      display: flex;
      justify-content: space-evenly;
      align-items: flex-start;
  }
  div {
      font-size: 25px;
      font-weight: bold;
      font-family: monospace;
      text-align: center;
  }
  aside {
      color: linen;
      height: 80px;
      width: 80px;
  }
  canvas {
      display: block;
      border: 2px solid #555;
      padding: 0.25rem;
      background: #d1d1d1;
  }
  button {
    background: firebrick;
    color: white;
    border: none;
    padding: 1rem;
    font-size: calc(12px + 2vmin);
    border-radius: 5px;
    cursor: pointer;
  }