body {
    font-family: "Times New Roman", Times, serif;
    font-size: 17px;
    line-height: 1.45;
    max-width: 40em;
    margin: 2em auto;
    padding: 0 1em;
}

img {
    max-width: 100%;
    height: auto;
}

nav a, nav b {
    display: inline-block;
    padding: 0.25em 0.9em;
    color: #000;
    text-decoration: none;
}

nav b {
    background: #e8e8e8;
}

nav a:hover {
    background: #f4f4f4;
}

figure {
    margin: 1.5em 0;
}

figure svg {
    max-width: 100%;
    height: auto;
}

figcaption {
    font-style: italic;
    font-size: 0.9em;
}

table {
    border-collapse: collapse;
}

th, td {
    border: 1px solid #999;
    padding: 0.3em 0.6em;
    text-align: left;
    vertical-align: top;
}

math[display="block"] {
    margin: 0.6em 0;
}