#player {
    width: 20px;
    height: 20px;
    background-color: red;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
    transition: all 0.2s ease;
}

.food {
    background-color: green;
    padding: 5px;
    color: white;
    position: absolute;
}

body {
    background-size: 100% 100%;
    overflow: hidden;
}