* {
    padding: 0;
    margin: 0;
}
body {
    display: block;
    width: 100%;
}
.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    gap: 0px;
}
.cell {
    width: 100px;
    height: 100px;
    border: 5px solid #000;
    border-collapse: collapse;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
}
.O {
    background: blue;
}
.X {
    background: red;
}
#canvas {
    width: 400px;
    height: 400px;
    background: #000;
    margin: 2%;
}