Blog-Title and Post-Title (showing Events) are not appearing

Hello,
my problem is, that the titles (H1) for my Blog and Events are not appearing.
I can scroll over it with my mouse and see so I the title is here, but it is “hidden” like white letter on white background.
(The titles for other pages are appearing. I created therefore a special formate.)

I tried to manage the problem with Custom-css:

/*page entry-title*/
.page .entry-title,
.blog .entry-titel,
.single-post .entry-titel {
color:grey;!important;
font-family: Kristen ITC; !important;
font-weight: bold; !important;
}

h1 {color:grey;!important;
font-family: Kristen ITC; !important;
font-weight: bold; !important;
}

But it doesn’t work.

Can you please help me?