website.css

/* CSS for website */
h1 , h2{
    border-bottom: 1px solid #EFEAEA;
    padding-bottom: 3px;
}
.markdown-section>:first-child {
    margin-top: 0!important;
}
.page-wrapper {
    margin-top: -1.275em;
}
.book .book-body .page-wrapper .page-inner section.normal {
    min-height:350px;
    margin-bottom: 30px;
}

.book .book-body .page-wrapper .page-inner section.normal hr {
    height: 0px;
    padding: 0;
    margin: 1.7em 0;
    overflow: hidden;
    background-color: #e7e7e7;
    border-bottom: 1px dotted #e7e7e7;
}

.video-js {
    width:100%;
    height: 100%;
}

pre[class*="language-"] {
    border: none;
    background-color: #f7f7f7;
    font-size: 1em;
    line-height: 1.2em;
}

.book .book-body .page-wrapper .page-inner section.normal {
    font-size: 16px;
    font-family:  "ubuntu", "Tahoma", "Microsoft YaHei", arial, sans-serif;
}

.aceCode {
  font-size: 14px !important;
}

input[type=checkbox]{
    margin-left: -2em;
}

.page-footer span{
    font-size: 12px;
}

.page-footer .copyright {
    float: left;
}

.body, html {
    overflow-y: hidden;
}

.versions-select select {
    height: 2em;
    line-height: 2em;
    border-radius: 4px;
    background: #efefef;
}