.bulb {
    display: inline-block;
    width: 60px;
    height: 60px;
    border: 2px solid black;
    cursor: pointer;
    border-radius: 100px;
    font-size: 0;
    background-color: white;
}

body {
    background-color: beige;
    text-align: center;
}

h1 {
    color: red;
}

#board {
    font-size: 0;
}