html {
    font-size: 62.5%;
}
body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 1.6rem;
    margin: 0;
}
h1,
h2,
h3 {
    font-family: Georgia, 'Times New Roman', serif;
}
h1 {
    font-size: 2.4rem;
}
h2 {
    font-size: 2.0rem;
}
h3 {
    font-size: 1.8rem;
}
a {
    text-decoration: none;
}
a,
a:hover {
    color: #f00;
}
nav {
    align-items: center;
    border-bottom: solid 1px #dedede;
    display: grid;
    gap: 1rem;
    grid-auto-flow: column;
    justify-content: center;
    padding: 0.5rem 1rem;
}
.site-name {
    font-size: 2.2rem;
    font-weight: 600;
}
main {
    min-height: 100vh;
    padding: 0.5rem 1rem;
    text-align: center;
}
fieldset {
    border: 0;
    display: block;
    margin-bottom: 1rem;
}
label {
    font-weight: 600;
}
button {
    background-color: #f00;
    border: solid #000 2px;
    color: #fff;
    font-weight: 600;
    text-transform: uppercase;
    padding: 0.5rem 2rem;
}
footer {
    border-top: solid 1px #dedede;
    color: #666;
    font-size: 1.2rem;
    margin-top: 1rem;
    padding: 2rem 1rem;
    text-align: center;
}