Theme not showing..only html

On of the possiblility is: wrongly setting for temporary folder.

This may happen when we transfer file  database from localhost to live server but we forgot to resetting the temporary folder..

So, we have change it corectly as below: - 
Go to: http://SITENAME/admin/config/media/file-system

then change the temporary folder like: /sites/default/file/private/tmp


Another posibility is permission setting..look at it

* But first try to correct the temporary folder first..and if problem still persist..then proceed to the second option