Fix rectangle flashing on pages with a relative-positioned <body>.
Fix rectangle flashing on pages with a relative-positioned <body>.

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