In my post, I am asking about two column's "next to" each other, but I was able to find the the UI option to change that. You have to click "edit" on the layout element and then in the right pane that shows up, click "Spaces" and then set all the left and right spaces to 0. That brings the two columns together, but, it doesn't solve the problem of the background color. I have set the same background color for both content items, but they don't "fill" in the whole column. How do you fill in a layout element's background?
I also stated that I am trying to do this through the "backend UI", meaning, no master page or CSS wrapper. Is this possible to do, as I am not seeing the right options to change all the styling. Can you please explain in steps or with screenshots how to fill in the background color for the space each layout element and column takes up?
I know of W3 schools, and I can write this myself if I didn't want to use Sitefinity and write my website from scratch using "divs", "spans", and "tables". What I want to know is, how am I suppose to do this in Sitefinity.
UPDATE 1: I can confirm no spacing by default between vertically stacked layout elements and have removed that question from above. I set the BackColor to something other than the page background and saw it fill in, though this only worked for some widgets and not all. An example of a widget where whole background color is not filled in would be the login/logout button. Here, only a small enclosing background is set with the value in BackColor, and the rest of the layout column that it lives in is unchanged.
Another question: Where is the documentation for all the CSS classes/properties for each Sitefinity widget, so that I could completely style a widget, like the navigation widget. When looking at this styling link, http://www.sitefinity.com/documentation/documentationarticles/user-guide/widgets/navigation-widgets-group/configuring-the-navigation-widget/style-the-navigation-widget
the example CSS only shows some of the selectors. How do I find the full CSS reference for this widget and other widgets?