body{
    text-align: center;
    background-color: black;
    color: white;
}

#jeu{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    width: 300px;
    margin: auto;
}

.case{
    border: 3px solid white;
    height: 100px;
    line-height: 100px;
    font-size: 60px;
    cursor: pointer;
}

footer{
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 12px;
    align-items: center;
    margin-bottom: 20px;
    width: 99%;
    position: absolute;
    bottom: 0;
}

.button{
    color: black;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: large;
    background-color: white;
    height: 40px;
    width: 200px;
    border-radius: 20px;
}

.button:hover{
    height: 45px;
    width: 205px;
    border-radius: 25px;
    cursor: pointer;
    background-color: aliceblue;
}

@keyframes fondAnime {
    0% { background-color: black; }
    25% { background-color: navy; }
    50% { background-color: rgb(58, 102, 184); }
    75% { background-color: rgb(168, 51, 112); }
    100% { background-color: rgb(118, 52, 154); }
}

body {
    text-align: center;
    color: white;
    animation: fondAnime 5s infinite alternate;
}