For each error, you can click through on GSC/WT to see the list of pages suffering from that error, and then click through on each one to get more details with the error.
I haven’t had any stylesheet errors, but have had a couple of invalid HTML tags which is almost always a case of the AMP plugin having trouble with typos in the article, e.g.:
<h>Whoops</h2>
or
<strongWhoops again
