Fix HTML legend styles
Fix HTML legend styles

Make the default background color #F0F0F0.  Fix the application of the
border and background colors.

alanponce/Flotr2,beastlike/Flotr2,beastlike/Flotr2,HumbleSoftware/Flotr2,HumbleSoftware/Flotr2,jessiejea/Flotr2,jessiejea/Flotr2,jessiejea/Flotr2,nicgallardo/Flotr2,beastlike/Flotr2,RobertoMalatesta/Flotr2,RobertoMalatesta/Flotr2,alanponce/Flotr2,alanponce/Flotr2,nicgallardo/Flotr2