td {
    width: 50px;
    height: 50px;
    border: 1px solid black;
}

td:hover {
    background-color: aqua;
}

.inactive {
    background-color: white;
}

.active {
    background-color: red;
}

button {
    margin: 2rem;
}

#next_gen_btn {
    background-color: green; 
}

#clear_btn {
    background-color: red; 
}