Kazek

By slider description you mean post intro? Is it possible to make post excerpt a description used in slide?

Actually I haven’t changed this line, but adding this without “Z” helped:

.single-article .post-single-img {
-webkit-transform: translate(0);
}

Thanks for help! ??

Yes, there is one – “co authors”, but it doesn’t work with the theme. :/

Could you elaborate a bit about child theme? How to create it? Would it be enought to modify templates/content-singleportfolio.php file and upload to child theme folder?