haystack/docs/v1.3.0/_src/api/_static/floating_sidebar.css

div.sphinxsidebarwrapper {
    position: relative;
    top: 0px;
    padding: 0;
}

div.sphinxsidebar {
    margin: 0;
    padding: 0 15px 0 15px;
    width: 210px;
    float: left;
    font-size: 1em;
    text-align: left;
}

div.sphinxsidebar .logo {
    font-size: 1.8em;
    color: #0A507A;
    font-weight: 300;
    text-align: center;
}

div.sphinxsidebar .logo img {
    vertical-align: middle;
}

div.sphinxsidebar .download a img {
    vertical-align: middle;
}