div.gridmaster {
    display: grid;
    grid-gap: 10px;
    padding: 10px;
    grid-template-columns: auto auto auto;
    grid-template-rows: 1 2 3;
}

div.gridmaster div {
    background-color: rgb(192, 70, 13);
    border: 1px solid rgba(0, 0, 0, 0.8);
    padding: 20px;
    font-size: 30px;
    text-align: center;
}

div.gridmaster div:hover {
    background-color: #987123;
}