body, pre {
    font-family: "UDデジタル教科書体 R", "UDDigiKyokasho R", "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif !important;
}
h2 {
    font-size: 1.4rem;
}
h3 {
    font-size: 1.3rem;
}
h4{
    font-size: 1.2rem;
}
.underline {
    text-decoration: underline;
}
hr {
    margin-top: 0;
    margin-bottom: 1.5rem;
}
ul.serial-index {
    display: block;
    margin: 0;
    padding: 0;
    width: 100%;
    font-size: 1rem;
    font-weight: normal;
    text-align: right;
}
ul.serial-index li {
    display: inline-block;
    background: transparent;
    list-style-type: none;
    list-style-image: none;
    margin: 0;
    padding: 0.2em 0.6em;
    width: auto;
    white-space: nowrap;
    font-weight: bold;
}
ul.serial-index li.current-menu {
    color: #fff;
    background-color: #3a6369;
}
ul.serial-index li a {
    font-weight: 500;
    color: #3a6369;
    text-decoration: underline;
}
sub.release-date{
    font-size: small;
    text-align: right;
}
.mt-sm-0 {
    margin-top: 0 !important;
}