Text Colour Changes

Hi,

I've been trying to apply the Custom CSS Style to be able to change the style on the text for the Add More Text. I'm not sure if it's implementing right. I'm simply referencing the name of my CSS class in the box and the CSS itself is going in the Additional CSS for my theme.

This is what I have for the CSS class (just junk while I try to get it working).

.group_style {
    text-decoration: overline;
    text-decoration-color: red;
    font-weight: bold;
    color: #ff0000;
}

What I see is that the font-weight seems to work fine and only seems to apply to the Add More Text (which is what I want) but I think this is more by luck than anything else. The only other style I've applied that seems to work is the background-color which appears behind a number of the cloned groups so probably as expected. None of the others here seem to do anything but I do see them appear briefly while the page is being rendered but when fully rendered the styles have been overridden and vanish.

Have I done something wrong? Or is it that the feature doesn't actually work the way I think it does?

All I actually want for now is to make the Add More Text stand out better as the users aren't noticing it there.