.row {
    display: flex;
    justify-content: center;
    align-items: center;
}
.col {
    width: 100px;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;

    border: 1px solid gray;
    font-size: 50px;
}
button {
    margin: 50px;
    margin-bottom: 20px;
    margin-top: 20px;
    width: 700px;
}
.col:hover {
    cursor: pointer;
    background-color: azure;
}
#msg {
    height: 20%;
    margin: 0px;
}