phoenix/assets/css/index.css

.page {
    padding: 2em 1em;
}

.row {
    display: flex;
    flex-wrap: wrap;
    gap: 1em;
    margin-top: 3em;
}

.group {
    width: 100%;
}

h2 {
    margin-top: 0;
}

a {
    display: block;
    margin-top: 10px;
}

@media screen and (min-width: 600px) {
    .page {
        padding: 2em 10em
    }
    .group {
        max-width: 230px;
    }
}