.wy-menu-vertical > ul:nth-child(3) {
    padding-left: 20px;
}


.wy-menu-vertical li.current > a button.toctree-expand {
    display: none;
}

.wy-menu-vertical > ul:nth-child(4) li.current > a button.toctree-expand {
    display: block;
}

.wy-menu-vertical p.caption {
    margin-top: 0px;
    text-transform: initial;
    color: #d9d9d9;
}

.wy-nav-content {
    max-width: initial;
}

.section img {
    border: 1px solid red;
}