Revert "cleans the styles-small-screen CSS file."

This reverts commit 02a89ae733d9e252d9078870ce24dfb98e8325ea.
Revert "Revert "cleans the styles-small-screen CSS file.""

This reverts commit 8a40c08876d9a3b9bbb3c455ebc7b8ec3437ab0e.