body {
    font-family: Arial, sans-serif;
    display: grid;
    justify-content: center;
    align-items: center;
    background: #2c2f33;
    color: white;
    grid-template-columns: repeat(3, 25%);
    grid-column: center;
  }

  a.button {
    background: #7289da;
    padding: 1em;
    border-radius: 5px;
    text-decoration: none;
    color: white;
    font-weight: bold;
    font-size: 1.2em;
    margin: 10px;
    text-align: center;
  }

  a.button:hover {
    background: #5b6eae;
  }

  .one {
    grid-column: 1/5;
    grid-row: 1;
    text-align: center;
  }

  #two {
    grid-column: 1;
    grid-row: 2;
  }

  #three {
    grid-column: 3;
    grid-row: 2;
  }

  #four {
    grid-column: 1;
    grid-row: 3;
  }
  #six {
    grid-column: 3;
    grid-row: 3;
  }

  #five {
    grid-column: 2;
    grid-row: 2/4;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 500px;
  }

  footer {
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background-color: rgba(245, 245, 245, 0.8);
    /* corrigé */
    color: #000000;
    font-size: 14px;
  }