title: CSS theming of GtkCalendar marked days
body: <p>I'm trying to modify existing theme <code>.css</code> files for a Linux Desktop (Ubuntu Unity in my case), so that they suit my needs. Looking at already existing themes I was able to reverse engineer most of it, but for some widgets I was not able to theme them properly. On of it are the marked days in a GtkCalendar. 
  What do I need to modify in the <code>.css</code> files so that I can modify the font-color of the marked days (the ones bold in the Calendar, i.e. Something is happening at that day; red rectangle). It is not the <code>color</code> property because <code>color:</code> only changes the color of the non-marked days (as it can be seen in the screenshot,28th December)</p>
  
  <p>For reference: This is the file I'm trying to modify. It's written in SASS but that doesn't matter <a href="https://github.com/shimmerproject/Numix/blob/master/gtk-3.0/scss/widgets/_calendar.scss" rel="nofollow noreferrer">https://github.com/shimmerproject/Numix/blob/master/gtk-3.0/scss/widgets/_calendar.scss</a></p>
  
  <p><a href="https://i.stack.imgur.com/47FwL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/47FwL.png" alt="enter image description here"></a></p>