style.css

* {
    padding: 0;
    margin: 0;
}

.body {
    background: url("../image/bg.jpg");
    min-height: 100vh;
    background-size: 100vw 100vh;
    background-repeat: no-repeat;
    display: flex;
    justify-content: center;
    align-items: center;
}

#scoreBox {
    position: absolute;
    top: 20px;
    right: 150px;
    font-size: 39px;
    font-weight: bold;
}

#hiscoreBox {
    position: absolute;
    top: 70px;
    right: 90px;
    font-size: 39px;
    font-weight: bold;
}

#board {
    background: linear-gradient(rgb(150, 230, 150), rgb(221, 221, 113));
    width: 90vmin;
    height: 90vmin;
    border: 2px solid black;
    display: grid;
    grid-template-rows: repeat(18, 1fr);
    grid-template-columns: repeat(18, 1fr);
}

.head {
    background: linear-gradient(rgb(228, 90, 90), rgb(214, 214, 92));
    border: 2px solid purple;
    transform: scale(1.02);
    border-radius: 9px;
}

.snake {
    background-color: rgb(0, 2, 128);
    border: -25vmin solid white;
    border-radius: 8px;
}

.food {
    background: linear-gradient(rgb(214, 31, 31), rgb(230, 30, 153));
    border: -25vmin solid black;
    border-radius: 8px;
}