added vertical margins to h3 split code samples in Shiny New Things
added vertical margins to h3
split code samples in Shiny New Things

--HG--
branch : 0.11.0

adamralph/xbehave.net,xbehave/xbehave.net,modulexcite/xbehave.net,modulexcite/xbehave.net,hitesh97/xbehave.net,mvalipour/xbehave.net,hitesh97/xbehave.net,mvalipour/xbehave.net