#left_bar {
    position: fixed;
    color: #fafafa;
    background-color: #272727;
    font-size: 18px;
    width: 300px;
    height: 100%;
    overflow-y: auto;
}

#left_bar ul {
    list-style-type: none;
    padding: 0;
    overflow: 0;
    margin: 0;
}

#left_bar li {
    list-style-type: none;
    margin-left: 24px;
    color: #777;
    line-height: 1.2em;
    margin-top: 0.7em;
    margin-bottom: 0.7em;
}

#left_bar a {
    padding: 0;
    overflow: 0;
    margin: 0;
    color: #bbb;
    text-decoration: none;
}

#left_bar .highlighted-page {
    color: #FFF
}

#left_bar .directory-entry {
    display: flex;
    align-items: center;
    line-height: 1.2em;
    margin-top: 0.7em;
    margin-bottom: 0.7em;
}

#left_bar .contract-content-button {
    width: 12px;
    height: 12px;
    margin-left: 6px;
    margin-right: 6px;
    background-image: url("minus.png");
    background-size: contain;
    cursor: pointer;
}

#left_bar .expand-content-button {
    width: 12px;
    height: 12px;
    margin-left: 6px;
    margin-right: 6px;
    background-image: url("plus.png");
    background-size: contain;
    cursor: pointer;
}