Post Title Color Problem

Hi, I changed in the theme pannel the color of my posts titles to a grey color (they look good with Style 2):
https://projectmanagers.org/big-data-trends/

The problem is that now posts with Style 7 show also this grey color backound and looks ugly:
https://projectmanagers.org/pmp-roadmap-book-review/

When the post titles where black in Style 2, at Style 7 they were white. This is what I was expecting when I changed black titles to grey. In Syle 7 they should remain white.

How can I fix this?

This is another example: in Style 7 titles cann’t get read:
https://projectmanagers.org/what-is-big-data/

I need my grey color only in Style 2. The same as happened when it was in black.

I have fixed it with this CSS code:

.td-post-template-7 .entry-title {
color: #fff!important;
}