body {
    font-family: Arial, sans-serif;
    background-color: #d8c7a3;
    background-image:
        linear-gradient(45deg, rgba(255,255,255,0.18) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(255,255,255,0.18) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(0,0,0,0.04) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(0,0,0,0.04) 75%);
    background-size: 24px 24px;
    color: #222;
    margin: 0;
    padding: 24px 12px;
}

.page {
    max-width: 700px;
    margin: 0 auto;
    background: #fff;
    border: 3px solid #222;
    padding: 24px;
}

.masthead-image {
    margin: -24px -24px 26px -24px;
    line-height: 0;
}

.masthead-image img {
    display: block;
    width: 100%;
    height: auto;
}

.visually-hidden {
    position: absolute;
    left: -9999px;
}

h1 {
    font-size: 28px;
    line-height: 1.2;
    margin-top: 0;
}

h2 {
    font-size: 22px;
    line-height: 1.25;
}

p, li {
    font-size: 17px;
    line-height: 1.6;
}

.answer {
    margin-bottom: 32px;
}

.toc {
    border-top: 2px solid #222;
    padding-top: 18px;
    margin-top: 24px;
}

details {
    border: 1px solid #ccc;
    padding: 10px 12px;
    margin-bottom: 10px;
    background: #fafafa;
}

summary {
    font-weight: bold;
    cursor: pointer;
}

.toc ul {
    margin-bottom: 0;
}

.footer {
    border-top: 2px solid #222;
    margin-top: 28px;
    padding-top: 14px;
    font-size: 13px;
    color: #555;
}

.footer p {
    font-size: 13px;
    line-height: 1.4;
}

.copyright {
    text-align: center;
}

a {
    color: #0645ad;
}

.not-found {
    border: 2px solid #222;
    padding: 16px;
    background: #fff7f7;
}

@media (max-width: 520px) {
    body {
        padding: 18px 10px;
    }

    .page {
        padding: 18px;
    }

    .masthead-image {
        margin: -18px -18px 22px -18px;
    }

    h1 {
        font-size: 24px;
    }

    h2 {
        font-size: 20px;
    }

    p, li {
        font-size: 16px;
    }
}