body {
    margin: 0;
    font-family: monospace;
    text-align: center;
    height: 100vh;
    width: 100vw;
    background-image: url("https://www.freepik.com/free-vector/detailed-abstract-white-background_16139729.htm");
    background-size: cover;
  }
  
  #mainContainer {
    transform-origin: 0% 0%;
    position: absolute;
    width: 100%;
    top: 0;
    left: 0;
  }
  
  #score {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: 60px;
    font-weight: 900;
    color: #00000099;
  }
  
  #showPoint {
    position: absolute;
    top: 0;
    left: 0;
    background: transparent;
    margin: 0;
  }
  
  #showPoint .u {
    position: absolute;
    display: inline-block;
    top: 50%;
    left: 70%;
    font-size: 30px;
    font-family: arial;
    opacity: 0;
    transition: top 0.1s linear, left 0.1s linear;
  }
  
  #animCanvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 100;
    border-bottom: 1px solid blue;
  }
  
  #arrs {
    font-size: 30px;
    text-align: left;
    position: absolute;
    margin: 0;
    top: 0;
    padding-left: 10px;
  }
  
  #startMenu {
    position: absolute;
    top: 0;
    left: 0;
    background: #fff;
    z-index: 1000;
    width: 100%;
    height: 100%;
  }
  
  #startMenu h1 {
    font-size: 50px;
    text-shadow: 2px 3px #aaa;
    font-weight: 900;
  }
  
  #startMenu button {
    font-size: 22px;
    background: none;
    border: none;
    border-top: 3px solid #000;
    border-bottom: 3px solid #000;
    padding: 10px 30px 5px;
    line-height: 20px;
    outline: none;
  }
  
  #startMenu h2 {
    font-size: 25px;
  }