Review the css and theme also like we do for code using code review module To check my code in custom module we use Code Review module.   Is there a similar module for themes and CSS?
If by the 'Code Review module' you mean the Coder module, it already supports reviewing the code in themes.


  Beginning with the 5.x-2.x version, this module adds a new UI, core
  support, theme support, and a cache for faster display of unchanged
  files. It also supports rule #severity levels of "minor", "normal",
  and "critical."