index.css

.doc {

}

.doc h1:hover .header-anchor,
.doc h2:hover .header-anchor,
.doc h3:hover .header-anchor,
.doc h4:hover .header-anchor,
.doc h5:hover .header-anchor,
.doc h6:hover .header-anchor{
    visibility: visible;
}

.doc .header-anchor{
    visibility: hidden;
    font-size: 14px;
    color: inherit;
    float: left;
    padding-right: 4px;
    margin-left: -14px;
}

.doc-demo-box {
    border: 1px solid #eee;
    margin-bottom: 20px;
}

.doc-demo-box:hover {
    box-shadow: 0 0 8px 0 rgba(232, 237, 250, .6), 0 2px 4px 0 rgba(232, 237, 250, .5);
    z-index: 10;
}

.doc-demo-instance {
    padding: 10px;
}

.doc-demo-instance>h4 {
    margin: 0 0 10px;
    font-size: 14px;
}

.doc-demo-meta {
}

.doc-demo-description {
    border-top: 1px solid #eee;
    padding: 10px;
}

.doc-demo-description>p {
    margin: 0;
}

.doc-demo-code {
    display: none;
    border-top: 1px dashed #eee;
    padding: 10px;
}

.doc-demo-code>pre {
    background: white;
    margin: 0;
    padding: 0;
    border: none;
}

.doc-demo-code-btn {
    padding: 10px;
    border-top: 1px solid #eee;
    cursor: pointer;
}

.doc-demo-code-btn i {
    margin: auto;
    display: block;
    border-bottom: 8px solid transparent;
    border-left: 8px solid transparent;
    border-top: 8px solid #eee;
    border-right: 8px solid transparent;
    margin-bottom: -8px;
    width: 0;
    height: 0;
}

.doc-demo-box.doc-demo-code-active .doc-demo-code {
    display: block;
}

.doc-demo-box.code-active .doc-demo-code-btn i {
    border-top: 8px solid transparent;
    border-left: 8px solid transparent;
    border-bottom: 8px solid #eee;
    border-right: 8px solid transparent;
    margin-top: -8px;
    margin-bottom: 0;
}