body {
    font-family: 'Arial', sans-serif;
    background-color: #F2DD77;
    margin: 0;
    padding: 0;
  }
  
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .square {
    width: 400px;
    height: 400px;
    margin: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    color: white;
    border-radius: 10px; 
    font-weight: 1000;
    transition: background-color 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  
  .square:nth-child(1) {
    background-color: white;
  }

  .square:nth-child(2) {
    background-color: #DD5350;
  }
  
  .square:nth-child(3) {
    background-color: #99D69F;
  }
  
  .square:nth-child(4) {
    background-color: #9FDAF4;
  }
  
  .square:hover {
    opacity: 0.7;
  }
  
  .square span {
    font-size: 24px;
  }
  
  .square::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
  }
  
  .square:hover::before {
    opacity: 1;
  }
  
  .container a {
    text-decoration: none;
  }

  .cell {
    width: 75px;
    height: 75px;
  }

  footer {
    display: flex;
    justify-content: center;
    padding: 5px;
    background-color: #45a1ff;
    color: #fff;
  }