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changes hovercard background color to grey on hover

diaspora/diaspora,Muhannes/diaspora,jhass/diaspora,diaspora/diaspora,KentShikama/diaspora,geraspora/diaspora,geraspora/diaspora,despora/diaspora,SuperTux88/diaspora,diaspora/diaspora,jhass/diaspora,Amadren/diaspora,spixi/diaspora,Muhannes/diaspora,jhass/diaspora,Flaburgan/diaspora,Amadren/diaspora,spixi/diaspora,despora/diaspora,SuperTux88/diaspora,spixi/diaspora,jhass/diaspora,Flaburgan/diaspora,SuperTux88/diaspora,spixi/diaspora,diaspora/diaspora,SuperTux88/diaspora,KentShikama/diaspora,Amadren/diaspora,despora/diaspora,geraspora/diaspora,KentShikama/diaspora,Muhannes/diaspora,Amadren/diaspora,KentShikama/diaspora,Flaburgan/diaspora,geraspora/diaspora,despora/diaspora,Muhannes/diaspora,Flaburgan/diaspora