body {
    font-family: sans-serif;
    font-size: 18px;
    color: #333;
}
body > header {
    padding: 1em;
}
body > header img.signature {
    max-width: 20rem;
    display: block;
    margin: 0 auto;
}
body > header h1 {
    font-size: 2em;
    text-align: center;
    font-weight: normal;
}
body > header :last-child {
    margin-bottom: 0;
}
body > header,
body > main,
body > footer {
    max-width: 40rem;
    margin: 0 auto 2rem;
}
body > main section h1 {
    font-size: 1.5rem;
}
body > main section h2 {
    font-size: 1.25rem;
}
body > main section:not(:last-child) {
    margin-bottom: 3rem;
}
body > footer {
    text-align: center;
    font-size: .67777777em;
}
body > footer a:link,
body > footer a:visited,
body > footer a:active {
    color: #333;
    text-decoration: none;
    font-weight: bold;
}

a:link, a:visited, a:active {
    color: #c03;
}

a:hover, a.active {
    color: #333;
}

a.button, a.button:visited, a.button:active {
    color: #fff;
    background-color: #c03;
    border: 2px solid #c03;
    border-radius: .3em;
    text-decoration: none;
    padding: .5em 1em;
}
a.button:hover, a.button:active {
    color: #c03;
    background-color: #fff;
}
a.disabled, a.button.disabled, a.button.disabled:active, a.button.disabled:visited {
    border: 2px solid #ccc;
    color: #ccc;
    background-color: #fff;
    cursor: not-allowed;
}
.cta {
    font-size: 1.2em;
    text-align: center;
    margin: 1.67rem 0;
}
.warn {
    border: 2px solid #ffceb8;
    background-color: #ffeee6;
    border-radius: .25em;
    padding: 2em;
    color: #ff5f15;
    font-weight: bold;
}
details {
    margin-left: 0;
    margin: 0 0 1.33em 0;
}
details p {
    margin: 0 0 .66em 0;
}
summary {
    font-weight: bold;
    margin-bottom: .2em;
}
code {
    font-size: .9rem;
    color: #666;
    font-weight: bold;
}