body{
    color:black;
}
#board {
    margin-left: auto;
    margin-right: auto;
    width: 630px;
    height: 630px;
    grid-template-columns: repeat(3, 1fr);
    display: grid;
}
.square {
    background-color: lightgray;
    width: 200px;
    height: 200px;
    font-size: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.square:hover {
    background-color: gray;
}
#restartButton {
    display: block;
    background-color: lightgray;
    color: black;
    margin-left: auto;
    margin-right: auto;
    height: 50px;
    width: 250px;
}
#restartButton:hover {
    background-color: gray;
}