This one took time and a lot of experimentation. I wanted to use this exercise to be a bit more useful, so I kind of made like cheat sheet, reference page for CSS Grid Layout functionality. So in order to concise the information I had to do quite a lot of research (I liked it). It was really fun challenge. Both HTML and CSS were run by validators.
Your page looks good @paulauskas-linas. Nice job.
Minor style note. You don’t have to incorporate it if you don’t want to.
Add a little margin or padding on the right side so the text in the containers/sections don’t butt up against the edge.