styles.css

.isekai-collapse {
    display: inline-block;
    background: #fcfcfc;
    border: solid #eeeeee;
    border-width: 1px 1px 0.2em;
    box-shadow: 0 1px 2px 1px rgba(0,0,0,0.02);
    padding: 1.25em 1.75em;
    margin: 1em 0;
    min-width: 15em;
}

.isekai-collapse h2 {
    margin: 0 !important;
    display: inline-block;
    border-bottom-color: #cccccc !important;
    font-size: 1.2em !important;
}

.isekai-collapse .toctoggle {
    float: right;
}