* {
    padding: 0px;
    margin: 0px;
    box-sizing: border-box;
}

#grille {
    margin: auto;
    width: 30vmin;
    height: 30vmin;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    font-family: wingdings;
}

#grille .case {
    border: solid black 1px;
    display: grid;
    place-items: center;
}

body {
    text-align: center;
    align-content: center;
    max-width: 800px;
    margin: auto;
}