silverstripe-docsviewer/css/small.css

@media screen and (max-width: 540px) {
    #content-column {
        width: 100%;
        padding: 0;
    }

    #container {
        padding: 15px;
    }

    #sidebar-column {
        width: 100%;
    }

    #sidebar-column .sidebar-box {
        padding: 10px;
    }

    #footer {
        padding: 20px;
    }

    .pinned { position: absolute; left: 0; top: 0; background: #fff; width: 35%; overflow: hidden; overflow-x: scroll; border-right: 1px solid #ccc; border-left: 1px solid #ccc; }
    .pinned table { border-right: none; border-left: none; width: 100%; }
    .pinned table th, .pinned table td { white-space: nowrap; }
    .pinned td:last-child { border-bottom: 0; }
    
    div.table-wrapper { position: relative; margin-bottom: 20px; overflow: hidden; border-right: 1px solid #ccc; }
    div.table-wrapper div.scrollable table { margin-left: 35%; }
    div.table-wrapper div.scrollable { overflow: scroll; overflow-y: hidden; }    
    
    table td, table th { position: relative; white-space: nowrap; overflow: hidden; }
    table th:first-child, table td:first-child, table td:first-child, .pinned table td { display: none; }
    .pinned table td:first-child,
    .pinned table th:first-child { display: block; }
}