styles.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
      font-family: cursive;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      width: 100vw;
      margin: 0;
      background-image: url(images/darkwall.jpg);
      background-position: center;
      background-size: cover;
  }
  
  .game-container {
      display: grid;
      grid-template-columns: repeat(3, 150px);
      grid-gap: 0px;
  }
  
  .cell {
      width: 150px;
      height: 150px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 120px;
      color: #fff;
      cursor: pointer;
      transition: 1s;
      /* animation: grow 1s forwards; */
  }
  
  .cell.first {
     box-shadow: 5px 5px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.second {
     box-shadow: 0px 5px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.third {
     box-shadow: -5px 5px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.fourth {
     box-shadow: 5px 0px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.fifth {
     box-shadow: 0px 0px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.sixth {
     box-shadow: -5px 0px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.seventh {
     box-shadow: 5px -5px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.eighth {
     box-shadow: 0px -5px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  .cell.nineth {
     box-shadow: -5px -5px 5px 3px rgba(0, 200, 225, 0.8)
  }
  
  
  @keyframes grow{
    0%{
      opacity: 0.1;
    }
    
    100%{
      opacity: 1;
    }
  }
  
  .popup {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.6);
      justify-content: center;
      align-items: center;
  }
  
  .popup-content {
      background: linear-gradient(to bottom right, blue, pink);
      padding: 20px;
      border-radius: 5px;
      text-align: center;
      font-size: 55px;
      font-weight: bolder;
      color: red;
  }
  
  #restartButton {
    padding: 8px 16px;
    background: linear-gradient(to bottom right, pink, blue);
    border-radius: 50%;
    box-shadow: 0px 0 5px 5px rgba(200, 200, 225, 0.6);
    color: #fff;
    border: none;
    font-weight: bolder;
    border-radius: 6px;
    font-size: 20px;
    cursor: pointer;
    margin-top: 10px;
  }