Disabling the openlogin plugin is not a solution if you want the feature.
There are 2 solutions for this problem:
1: check the don't inline css option in the openlogin plugin.
(If this doesn't work as intended)
2: open the css file of open login plugin
There is a section in the css file with a comment line /* this should not creat any problem in snow flat*/ or something like that. Comment out the section(i guess its 2 or 3 lines)
Hopefully this will solve the problem. It worked for me.