style.css

.board{
    margin: auto;
    position: relative;
    width:200px;
    height: 200px;
    display:grid;
    grid-template-columns: repeat(3, auto);
}
.cell{
    border: 1px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 66px;
    height: 66px;
    font-weight: bolder;
}
.message{
    position: absolute;
    width: 200px;
    height: 200px;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.749);
    display: none;
}
.message-text{
    margin: 2rem 3.5rem;
    margin-bottom: 0;
    padding: 1rem;
    background-color: aliceblue;
    border-radius: 0.5rem;
    font-size: large;
    
}
.restart{
    background-color: rgb(61, 203, 72);
    color:white;
    margin: 2rem 3.5rem;
    padding:0.5rem;
    border: 1px solid darkgreen;
    border-radius: 0.5rem;
    font-size: larger;
}