Change the default CSS template.
Change the default CSS template.

'background-color' is no longer sufficient to override our default
styling. Refs #626.

tuchangwei/vimium,justalittlenoob/vimium,philc/vimium,PickRelated/vimium,philc/vimium,borgified/vimium,jb55/vimium-plus,bkudria/vimium,Aleroniponi/vimium,tuchangwei/vimium,justalittlenoob/vimium,wildeyes/vimium,PickRelated/vimium,Robinson10240/vimium,gdh1995/vimium,elegantwww/vimium,mrmr1993/vimium,willsALMANJ/vimium,zhangmin510/vimium,decaffeinate-examples/vimium,Robinson10240/vimium,dimatter/vimium,VPashkov/vimium,douglas-larocca/vimium,csmalin/vimium,justalittlenoob/vimium,zhangmin510/vimium,VPashkov/vimium,zhangmin510/vimium,douglas-larocca/vimium,borgified/vimium,dimatter/vimium,hhsue/vimium,hhsue/vimium,wildeyes/vimium,bkudria/vimium,smblott-github/vimium-smblott,csmalin/vimium,Lw-Cui/vimium,mrmr1993/vimium,smblott-github/vimium,cyrixhero/vimium,mrmr1993/vimium,elderbas/vimium,PrestanceDesign/vimium,Aleroniponi/vimium,elegantwww/vimium,bkudria/vimium,smblott-github/vimium,willsALMANJ/vimium,decaffeinate-examples/vimium,VPashkov/vimium,gdh1995/vimium,elegantwww/vimium,csmalin/vimium,jb55/vimium-plus,wildeyes/vimium,cyrixhero/vimium,smblott-github/vimium-smblott,Lw-Cui/vimium,smblott-github/vimium,elderbas/vimium,Aleroniponi/vimium,PrestanceDesign/vimium,hhsue/vimium,borgified/vimium,douglas-larocca/vimium,willsALMANJ/vimium,elderbas/vimium,Lw-Cui/vimium,decaffeinate-examples/vimium,philc/vimium,tuchangwei/vimium,gdh1995/vimium,crazypenguincode/vimium,PrestanceDesign/vimium,poacher2k/vimium,poacher2k/vimium,PickRelated/vimium,poacher2k/vimium,crazypenguincode/vimium,Robinson10240/vimium,cyrixhero/vimium,dimatter/vimium