Use chrome browser,
Right click on area of interest.
Select Inspect Element.
This will bring up dev console.
On the right --> side you can manipulate the css code. Look for color: #blabla or rgba (#,#,#,#)and modify them to see how the browser reflects the changes.
Then copy and paste that .whatever {color: clacla; size: 18px} into the custom css area in appearance settings.
If you give me a #color you want I'll try to help you customize .
