fuhi

Ok everything works but one more question : How is ID front page ?

Im css plugin all not work strange ;/

But in child themes first code works – hide block on all page .
Unfortunelly second code not works ;/ I put good id and nothing.

In css, section custom box :

.custom-box-about {display:none;}
.post-id-28 .custom-box-about {display:block;}

any idea why not works ?

Problem resolved but thanks. I can’t find css for portfolio.

Thanks for response, but I have one more question for pt.2 : Is it possible to change size of logo on width and hight all site-branding ?

.site-header {
background-image: url(“https://janpalony.com/wp-content/uploads/2015/11/cropped-Bez-nazwy-2.png”);

but i cant find it in style, header or any other file ;/