Added full-screen mode
	modified:   index.html
	new file:   js/custom.js
	modified:   less/layout.less
Merge remote-tracking branch 'dd/master'

Resolved Conflicts:
	index.html
Merge remote-tracking branch 'dd/master'
Background cover added
quizz: add structure code
---
	modified:   index.html
	modified:   less/layout.less