fixed #169: round colors to 3 digits
fixed #169: round colors to 3 digits

fboehm/labnotebook,fboehm/cboettig_site,antass/labnotebook3,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,antass/labnotebook3,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/labnotebook,antass/labnotebook3,fboehm/cboettig_site