body {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: white;
    color: rgb(52, 165, 52);
    box-sizing: border-box;
    touch-action: none;
}

canvas#snake {
    width: 90vmin;    /* 自动适配屏幕宽度 */
    height: 90vmin;   /* 保证正方形形状 */
    max-width: 512px;
    max-height: 512px;
    border: 2px solid #34a534;
    box-shadow: 0 0 10px #34a53480;
}