style.css

:root {
    font-family: sans-serif;
    font-size: 120%;
    line-height: 1.6;
    color: #333;
    text-align: center;
}

body {
    margin: 0;
}

h1, h2, h3, h4, h5, h6, .subtitle {
    font-family: serif;
    color: #006c66;
    line-height: 1.2;
}
h1 {
    margin: 0;
    font-size: 250%;
}
.subtitle {
    font-family: sans-serif;
    font-size: 120%;
}
h2 {
    font-family: sans-serif;
    font-size: 80%;
    text-transform: uppercase;
    margin-bottom: 3em;
}

blockquote {
    font-size: 150%;
}
blockquote footer {
    font-size: 1rem;
    margin-top: -1em;
}

.container {
    max-width: 50em;
    margin: 0 auto;
    padding: 0 0.5em;
}

.block {
    padding: 2em 0;
}
header.block {
    padding: 4em 0;
}

.bg-green {
    background-color: #00786c;
    color: #fff;
}
.bg-darkgreen {
    background-color: #006c66;
    color: #fff;
}
.bg-green a,
.bg-darkgreen a {
    color: inherit;
    text-decoration: none;
}
.bg-grey {
    background: #eee;
}

.tiles-features {
    display: grid;
    gap: 1em 3em;
    grid-template-columns: repeat(1, 1fr);
}

.tiles-links {
    margin: 0;
    padding: 0;
    list-style: none;

    display: grid;
    gap: 3em;
    justify-content: space-around;
    grid-template-columns: repeat(auto-fit, 4em);
}

@media (min-width: 36em) {
    .tiles-features {
        grid-template-columns: repeat(2, 1fr);
    }
}