CryoutColumns – Font-Color for text&title

Dear Cryout-Developers.
Another great WordPress Theme you created!
Now here is my Problem:
I used the Nirvana-Theme with the “Autumn-rose”-color-scheme.
I have some columns now, but the Columns-title (widgets->cryout-columns->title) is bit too dark to read by default.
So i added:
h3.column-header-image {
color: #fff;
in the “own css”-section on the nirvana-settings.
Looks fine now.
But when I have a lower resolution (Phone,Tablet) the column-title is white on a white background. The column-text by itself turns dark and is ok.
Anybody got an idea, where and how to change this?
Thanks. Kind regards.
Christian.