There are a few shortcodes which will make your experience managing the content on this site more enjoyable and simple.
Simple as can be. [gap] and then an arbitrary number of pixels you want the gap to be. If this number is negative, it will produce a negative margin, moving the content below toward the content above.
Add a color: blue, purple
Add a link: http://google.com
[button purple http://test.com/#mylink ]Button Text[/button]
[button http://google.com ]Submit[/button]
For either of these to integrate with custom css: class=”my-class” will add the specified class.