body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.contents {
    flex-grow: 1;
}

h1 {
    margin-top: 0.5em;
    margin-bottom: 1em;
}

.media img {
    width: 30%;
}

@media (min-width: 768px) {
    .media img {
        width: 20%;
    }
}