Focus is a Simple, Clean and Elegent Flat MyBB theme which can be used by all sort of community users, one of the cool features of this theme is shrinking header on scroll which looks really nice and works smoothly across all browsers. Some of the salient features of this theme are :-

Clean design with blend of blue and white
Text based icon which automatically changes size on scroll
Sticky header on top
Use of font-awesome based icons
Css based buttons with icons
Social sharing icons on footer
Gradient based white grey color on postbit and threads listing
4 column based footer with about us section and advertisement links
Scrolling top icon on footer
Sidebar with board stats and Who's Online
Sidebar advertisement section
Use of google font (Lobster)
And lots of cool features, try this out Smile

Focus MyBB theme is 100% Free to use and you can even edit the theme to your liking. If you need any help, don't hesitate to contact me at all. I request you to not remove MyBB credits or WallBB theme's copyright.

Support Thread :- http://community.mybb.com/thread-189771.html
Origial Website :- http://wallbb.co.uk/product/focus-flat-mybb-theme/
Git Link- https://github.com/WallBB/focus-mybb-theme