@keyframes fadeIn {
    0% {
        opacity: 0;
    }
    33% {
        opacity: 1;
    }
    66% {
        opacity: .5;
    }
    100% {
        opacity: 1;
    }
}

/* Apply the animation to all <td> elements with a background color */
td {
    animation: fadeIn 3s ease-in-out;
}

section {
    margin-bottom: 4rem;
}