visualiser le layout, ajouter en CSS:
[class="row"] {
border: 2px dotted rgba(255, 0, 0, 0.2);
}
[class^="col-"] {
border: 2px dotted rgba(0, 255, 0, 0.2);
}
solutions plus élaborées: http://stackoverflow.com/questions/12770591/easy-way-to-see-the-bootstrap-grid
Nested rows: http://stackoverflow.com/questions/24659471/nested-rows-with-bootstrap-grid-system
Creating Custom Panels Layouts & Content Types https://www.phase2technology.com/blog/creating-custom-panels-layouts-content-types/
panels bootstrap layout builder https://www.drupal.org/project/panels_bootstrap_layout_builder
collapsing left menu (vertical nav menu) http://www.bootply.com/88026# http://codepen.io/mikeair/pen/Kfyin/ https://stackoverflow.com/questions/22849009/bootstrap-3-vertical-nav-bar
nice left menu http://codecanyon.net/item/responsive-bootstrap-sidebar-navigation/11784410
general docs on navbar https://getbootstrap.com/components/#navbar
collapsible http://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_navbar_collapse&stacked=h http://www.w3schools.com/bootstrap/bootstrap_navbar.asp