body {
    margin: 0;
  }
  
  .game-canvas {
    width: 100%;
    height: 100vw;
    max-width: 500px;
    max-height:500px;
    margin-left: auto;
    margin-right: auto;
  }
  
  .keys {
    font-family: 'Lato', sans-serif;
    text-align: center;
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    height: 200px;
    margin: auto;
  }
  
  .up {
    position: relative;
    top: -4px;
  }
  
  .chevron::before {
    border-style: solid;
    border-width: 8px 8px 0 0;
    content: '';
    display: inline-block;
    height: 20px;
    width: 20px;
    top: -10px;
    position: relative;
    transform: rotate(-45deg);
  }
  
  .chevron.down::before {
    transform: rotate(135deg);
    top: -22px;
  }
  
  .chevron.right::before {
    transform: rotate(45deg);
    top: -18px;
    left: -5px;
  }
  
  .chevron.left::before {
    transform: rotate(225deg);
    top: -18px;
    left: 5px;
  }
  
  .arr {
    cursor: pointer;
    width: 70px;
    height: 70px;
    text-align: center;
    line-height: 100px;
    background: gray;
    color: white;
    font-size: 50px;
    border-right: 10px solid #ccc;
    border-bottom: 10px solid #ccc;
    border-left: 10px solid #ddd;
    border-top: 10px solid #eee;
    display: inline-block;
    margin: 5px;
    transition: all .05s linear;
    user-select: none;
  }
  
  .arr:active {
    background: #555;
  }
  
  #game-container {
    display: flex;
    flex-direction: column;
    background-color: rgba(220, 220, 220, 0.6);
  }