Thanks remark.no.
I figured this out, but only by copying my CSS-code
.featured-title {
font-size: 60px;
letter-spacing: -1px;
margin: 0;
padding-top: 40px;
text-align: center;
}
into it, seems not to be enough. I suppose this is because I didn’t attribute the code to a line? Then where do I have to place the information?
And how to make several changes?