body {
    margin: auto;
    max-width: 50em;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
}

header h1 {
    font-size: 150%;
    text-align: center;
}

nav > ul {
    width: 100%;
    position: relative;
    text-align: justify;
    text-align-last: justify;
    border-top: 2px solid #000;
    border-bottom: 2px solid #000
}

nav ul li {
    background: #fff;
    display: inline-block;
}

nav ul, nav li {
    margin: 0;
    padding: 0;
    list-style: none;
}

nav ul ul {
    min-width: 25%;
    display: none;
    position: absolute;
    text-align: left;
    text-align-last: left;
    border: 2px solid #000;
    top: 100%;
}

nav ul li:hover > ul {
    display:inherit;
}

nav ul ul li {
    float:none;
    display:list-item;
    position: relative;
}

nav a {
    padding: 5px 10px;
    display: block;
    color: #000;
    font-weight: bold;
    text-decoration: none;
}

nav > ul > li > a {
    padding: 10px;
    font-size: 120%;
}

nav a:hover{
    color: #fff;
    background: #000;
}

nav ul li:has(ul:hover) > a {
    color: #fff;
    background: #444;
}

article h1 {
    font-size: 150%;
    text-align: center;
}

article h2 {
    font-size: 120%;
}

article a {
    color: #000;
    text-decoration: underline #bfbfbf;
}

article a:hover {
    text-decoration: underline #000;
}

a.external {
    text-decoration: underline dotted #7f7f7f;
}

article figure {
    display: block;
    margin: auto;
}

article figcaption {
    text-align: center;
    font-size: 80%;
}

article p, article li {
    text-align: justify;
    line-height: 1.3;
}

.group-list {
    text-align: left;
    margin-top: 0.5em;
}