Hello Michael.

Thank you for your purchase, and for your kind words.

I entered the class in the column settings:

And then defined it in wpDataTables settings/Custom JS and CSS/Custom CSS like this:

table.wpDataTable .tabellen-zeile {
background-color: #2897ae !important;
font-weight: 600 !important;
font-size: 1.1rem;
}

And it came up looking like this:

Is this what you were trying to achieve?

Hi again Michael.

Please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. You can write credentials here just check Private Reply so nobody can see them except us.

Thanks for that Michael.

The table rows are seen as "odd" and "even", so plugin's CSS is already set to !important. That's why that CSS is overwriting yours.

I modified your CSS, and it works fine now. I had to add the "tr.odd td" and "tr.even td" to the class:

table.wpDataTable tr.odd.tabellen-zeile td {
font-weight: 600 !important;
font-size: 0.8rem;
background-color: #2897ae !important;
}
table.wpDataTable tr.even.tabellen-zeile td {
font-weight: 600 !important;
font-size: 0.8rem;
background-color: #2897ae !important;
}

Please take a look, and let me know if that looks good now.

You're welcome, Michael.

Glad I could help.

If you have any further questions or issues, please feel free to open a new ticket, and we'll gladly help.