body {
    margin: 0;
    padding:0;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    font-weight: bold;
    color: white;
}
#grille {
    height: 100vh;
    display: grid;
    grid-template-columns: 4fr 1fr;
    grid-template-rows: 1fr 1fr 4fr 1fr;
}
header {
    background-color: #0065a7;
    grid-column-start: 1;
    grid-column-end: 3;
    text-align: center;
}
nav {
    background-color: #124b78;
    grid-column-start: 1;
    grid-column-end: 3;
    text-align: center;
}
#main {
    background-color: #16a2c5;
    text-align: center;
}
aside {
    background-color: #5275ad;
    text-align: center;
}
footer {
    background-color: #7cccce;
    grid-column-start: 1;
    grid-column-end: 3;
    text-align: center;
}