How to fix the title banner to the top of page

[kbzsl]

I am looking for a solution to fix the title banner to the top of the rendered html page, while the rest of the page remains scrollable.

I tried to add some html tags, but it's not working as desired. And I don't have the required html/css knowledge to solve it.

#title-block-header {
  margin-block-end: 1rem;
  position: fixed;
  height: 75px;
}

By the way, do you know any place (user guide, blogpost) where some commonly used style definitions are presented? Like: size/position changes, renaming items (e.g. PUBLISHED) or removing