body{background-color:gainsboro;}

#board {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 0.3rem solid black;
    border-radius: 2.75rem;
    width: 49.1rem;
    height: 42rem;
    background-color: blue;
    margin-top: 3rem;
}

.row {
    display: flex;
    flex-direction: row;
}

button {
    width: 5.5rem;
    height: 5.5rem;
    border: 0.3em solid black;
    border-radius: 2.75rem;
    margin: 0.5rem;
    background-color: white;
}