* {
    box-sizing: border-box;
  }
  
  html, body {
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
  }
  
  .grid-container {
    display: grid;
    grid-template-areas: 
    "header header header header"
    "menu cartes-blanches cartes-blanches cartes-blanches";
    grid-template-columns: 1fr 2fr 2fr 2fr;
    grid-template-rows: 3fr auto;
    border: 2px solid black;
    background-color: red;
  }
  
  .cartes-blanches{
    grid-area: cartes-blanches;
    display:flex;
    flex-wrap: wrap;
    gap: 50px;
    padding: 20px;
  }
  
  .header {
    grid-area: header;
    display : flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-weight: bold;
    padding: 15px;
    border-bottom: 1px solid black;
    height: 20vh;
    color: white;
  }
  
  .item {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 300px;
    height: 350px;
    background-color:red;
    padding: 50px;
  }
  
  .menu {
    /*grid-column: 4 / 5;
    grid-row: 2 / -1;*/
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    background-color:red;
    padding: 10px;
    border-right: 1px solid #000;
  }
  h2 {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    text-align: center;
    margin: 0; 
    color: white;
  }