Web: correct formatting of CSS file
PEP8: correct numbers of blank lines
PEP8: remove blank lines at end of files
PEP8: break lines which are too long
PEP8: correct spaces around operators
PEP8: correct spaces around commas and colons
PEP8: remove spaces around kwarg assignments
PEP8: adjusted indentation
PEP8: correct comment format
DB: remove unnecessary cast to str