! https://github.com/ubuntu/yaru/blob/master/gtk/src/default/gtk-3.20/_ubuntu-colors.scss
#define color_base03   #181818
#define color_base02   #3D3D3D
#define color_base01   #5D5D5D
#define color_base00   #666666
#define color_base0    #FFFFFF
#define color_base1    #F7F7F7
#define color_base2    #CDCDCD
#define color_base3    #878787
#define color_yellow   #f99b11
#define color_orange   #E95420
#define color_red      #c7162b
#define color_magenta  #335280
#define color_violet   #762572
#define color_blue     #19B6EE
#define color_cyan     #007aa6
#define color_green    #0e8420
