/* 長い数式(mathjax)が横スクロールになる */
mjx-container {
    overflow-x: auto;
    overflow-y: hidden;
    max-width: 100%;
}

#content {
    max-width: 1200px;
}

#content img {
    display: block;
    margin: auto;
}

#table-of-contents {
    overflow-y: auto;
}

h4 {
    color: #00436a;
}
h5 {
    color: #207d93;
}

p.nav-prev,
p.nav-next {
    margin: 0;
    padding: 0;
    display: inline-block;
}

p.nav-prev {
    float: left;
}

p.nav-next {
    float: right;
}

a.nav-prev,
a.nav-next {
    display: inline-block;
    padding: 0.3em 1.2em;
    border: 1px solid #bbb;
    border-radius: 1em;
    background: #fafbfc;
    color: #222;
    text-decoration: none;
    font-weight: normal;
    transition:
        background 0.2s,
        color 0.2s;
    margin-top: 2em;
    margin-bottom: 1em;
}

a.nav-prev:hover,
a.nav-next:hover {
    background: #e0e7ef;
    color: #111;
}

a.nav-prev::before {
    content: "← ";
    color: #888;
}

a.nav-next::after {
    content: " →";
    color: #888;
}