body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 5px;
}

.cell {
    width: 100px;
    height: 100px;
    border: 1px solid #ccc;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 39px;
    cursor: pointer;
    background-color: black;
    color: blue;
}

.cell:hover {
    background-color: #f0f0f0;
}