body {
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    font-family: sans-serif;
}

h1,
footer {
    text-align: center;
}

section {
    margin: 1em;
    transition: color 0.5s, background-color 0.5s;
}

section:first-of-type {
    margin-top: 0;
}

section:last-of-type {
    margin-bottom: 0;
}

.inView {
    color: cadetblue;
    background-color: aliceblue;
}

footer {
    margin: 1em;
}

textarea {
    width: 100%;
    height: 4em;
}