:root {
    --font-size: 2rem;
    --game-over-msg-font: 3rem;
    --game-over-score-msg-font: 2rem;
    --game-over-score-padding: 1.5rem;
    --btn-font-size: 1.5rem;
    
  }
  * {
    padding: 0;
    margin: 0;
    box-sizing: content-box;
    
  }
  body {
    height: 100vh;
    max-height: 100vh;
    background-color: black;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image:url(https://img.freepik.com/premium-vector/abstract-paper-background-with-shadows-green-colors_444390-12263.jpg)
  }
  .container {
    width: 400px;
    height: 450px;
  
    position: relative;
  }
  #canvas {
    position: absolute;
    left: 0;
    bottom: 0;
  }
  .score {
    position: absolute;
    top: 0;
    left: 0;
  
    font-size: var(--font-size);
  
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: bolder;
  }
  .high-score {
    position: absolute;
    top: 0;
    right: 0;
  
    font-size: var(--font-size);
  
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: bolder;
  }
  .game-over {
    width: 100%;
    height: 100%;
  
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
  
    background-color: rgba(0, 0, 0, 0.85);
  
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
  
    font-size: var(--game-over-msg-font);
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  
    border: 1px solid rgb(33, 33, 33);
  }
  .message {
    font-weight: bolder;
  }
  .game-over-score {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
    padding: var(--game-over-score-padding) 0;
    font-size: var(--game-over-score-msg-font);
  }
  .play-again {
    background-color: rgb(17, 170, 25);
    color: rgb(201, 255, 203);
    padding: 1rem 1.5rem;
    margin-top: 1rem;
    font-size: var(--btn-font-size);
    border-radius: 0.75rem;
    transition: all 300ms ease-in-out;
    cursor: pointer;
  }
  .play-again:hover {
    padding: 1rem 2rem;
    background-color: rgb(23, 214, 33);
    color: rgb(254, 254, 254);
  }
  
  .hide {
    visibility: hidden;
  }