Vanilla 2.6 is here
! It includes security fixes and requires PHP 7.0. We have therefore ALSO released Vanilla 2.5.2
with security patches if you are still on PHP 5.6 to give you additional time to upgrade.
Please upgrade to 2.3 here.
The 2.2 and earlier branches are no longer being updated.
Superhero panel headers - bad color
This discussion is related to the Bootstrap
So I discovered that in your custom_superhero css in panel headers you have color from un-themed Bootstrap.
EDIT: My pc is a bit slow so my GitHub client is lagging so I cannot create pull request, but enable superhero theme and look at discussions headings. It it #F5F5F5 color and it should be #485563