Need some changes in cobalt.css for typora

As you can see, the main headings are bright, sub-headings aren't.
How to make them more visible ??

What changes need to be made to this css file?
cobalt.css (25.1 KB)

Using the latest version of cobalt theme --

Any other editors like typora for mac having image upload to cloud setting + outline sidebar + auto-switching back & forth from rendering to writing mode ????

Want to switch the sidebar to something this --

white over blue is fine as well....Pls help