Hide meta data

Hi there,
is it possible to hide all meta data (author, date, etc.) of the blog entries? I tried to add

.entry-meta .byline, .entry-meta .cat-links { display: none; }
.entry-meta .posted-on { display: none; }

to the css (in the customizer), but that didn′t work.

Is there any way to do this which I am missing or would this be custom coding?

Thanks in advance,
Sonja