style.css

body {
    background-color: #008080;
    font-size: large;
}

img {
    margin: 10px;
    image-rendering: pixelated;
}

img:hover {
    transform: scale(4);
    background: #008080;
}

header {margin: auto; text-align: center; color: #ddd; margin-bottom: 10px;}
header a {
    background: white;
    padding: 3px;
    border-radius: 5px;
}

main {
    max-width: 500px;
    margin: auto;
    display: grid;
    justify-content: center;
    grid-template-columns: repeat(9, auto);
    gap: 15px;
}

#links {
    max-width: 500px;
    background-color: white;
    padding: 3px 5px;
    display: block;
}

main > a {display: block;}

details {
    margin-bottom: 10px;
}

summary {
    cursor: pointer;
}

section {
    max-width: 500px;
    margin: 10px auto;
    color: black;
    color: #ddd;
}

@media screen and (max-width:400px) {
    main {
        grid-template-columns: repeat(5, auto);
    }
}

@media screen and (min-width:401px) and (max-width:600px) {
    main {
        grid-template-columns: repeat(6, auto);
    }
}