body {
    margin: 0;
    padding:0;
    font-size: 25px;
}
#conteneur {
    /* conteneur en mode grid*/
    display: grid;
    /* 2 colonnes de dimension identique 1 fraction*/
    grid-template-columns: repeat(2, 1fr);
    grid-template-areas: 
            "un un"
            "deux deux"
            "trois trois"
            "quatre six"
            "sept huit"
            "neuf neuf";
    /* permet d'occuper 100% de la hauteur de l'écran*/
    height: 100vh;
    /* Mise en place de sépararion*/
    grid-gap: 5px 10px;
}
.un {
    background-color: #f0da50;
    grid-area: un;
}
.deux {
    background-color: #f09450;
    grid-area: deux;
}
.trois {
    background-color: #22d5f0;
    grid-area: trois;
}
.quatre {
    background-color: #ee6da1;
    grid-area: quatre;
}
.cinq {
    background-color: #14b236;
    grid-area: cinq;
    /*ne plus afficher la zone 5 */
    display: none;
}
.six {
    background-color: #1483d9;
    grid-area: six;
}
.sept {
    background-color: #09f1ad;
    grid-area: sept;
}
.huit {
    background-color: #c7f571;
    grid-area: huit;
}
.neuf {
    background-color: #b2142e;
    grid-area: neuf;
}
#conteneur div {
    text-align: center;
    padding: 20px;
    font-family: arial;
    font-weight: bold;
}