body {
    padding: 2em 0;
    max-width: 60em;
    margin: 0 auto;
}

.alert {
    margin: 1.5rem 0;
}

section {
    margin-top: 1.5rem;
}

h2 {
    margin-top: 2em;
}

select[name="version"] {
    transition: background-color 0.5s ease;
}

img {
    max-width: 100%;
}