UI: Margin and allignment issues

In many cases, content is flush with other content/page sides with minimal or no padding. This can appear jarring.

Example: create event page on slim view

The addition of margins improves readability:

Further, there are a number of alignment issues such as:

I am happy to go around cleaning these up but I am aware that UI is often a subjective issue so let me know if this is something you want and I will submit a merge request.