divThe style div is a simple invisible wrapper that can be used organise elements freely on the page. This is very versatile in combination with Bootstrap classes (or any custom made style-sheet).
In the following some simple examples are shown where Bootstrap classes are used to arrange elements. For the sake of presentation the div wrappers are coloured such that it is possible to see how the wrappers are aranged.
Note that a lot of Bootstrap classes can be used with the div style (not only grid classes). In fact, a lot of the styles that are available within the WebApp are based on nested divs.
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div Styles and Grid Classes from Bootstrap