.toc_ul {
    padding: 0 20px 0;
}

.toc_li_chapter {
    margin: 5px 0 5px 0;
    list-style-image: url('toc-chapter-closed.png');
}

.toc_li_chapter_current {
    margin: 5px 0 5px 0;
    list-style-image: url('toc-chapter-open.png');
}

.toc_li_topic {
    margin: 5px 0 5px 0;
    list-style-image: url('toc-topic.png');
}

.toc_li_topic_current {
    margin: 5px 0 5px 0;
    list-style-image: url('toc-topic-current.png');
}

#container, html, body {
    height: 99%;
}

#left {
    float: left;
    width: 200px;
    height: 100%;
    overflow: auto;
    white-space: nowrap;
}

#middle_spacing1 {
    float: left;
    width: 10px;
    height: 100%;
}

#middle {
    float: left;
    width: 1px;
    height: 100%;
    background-color: black;
}

#middle_spacing2 {
    float: left;
    width: 10px;
    height: 100%;
}

#right {
    float: left;
    width: calc(100% - 225px);
    height: 100%;
    overflow: auto;
}