#field {
    display: grid;
    grid-template-columns: repeat(32, 16px);
    grid-template-rows: repeat(32, 16px);
    gap: 1px;
}

#field div {
    border: solid 1px black;
    background-color: white;
}

#field.gameover div {
    background-color: gray;
}

#field div.player {
    background-color: red;
}

#field div.tail {
    background-color: orange;
}

#field div.item {
    background-color: blue;
}