body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 0;
}

header {
    background-color: #333;
    color: white;
    padding: 20px 0;
}

main {
    padding: 20px;
}

#play-board {
    width: 400px;
    height: 400px;
    margin: 20px auto;
    background-color: #f0f0f0;
    border: 2px solid #333;
    position: relative;
}

.snake {
    width: 20px;
    height: 20px;
    background-color: green;
    position: absolute;
}

.food {
    width: 20px;
    height: 20px;
    background-color: red;
    position: absolute;
}