h2 h3 h4 are identical

When browsing through the documentation, when there are nested sections, it is difficult to tell when one section ends and another begins.

For example, reading through the Model View Programming Section (http://doc.qt.io/qt-5/model-view-programming.html)) it is hard to follow when a topic change happens or if a subsection of a topic is starting. One way to test if it is usable is to find the end of the Model Subclassing Reference section. (Looking at the source of the webpage you can see that it ends at The Model/View Classes.

I am aware that the documentation is available in Qt Creator, but web browsers are the way it is linked to by other websites (i.e. stackoverflow or the forums).

(Btw, the new website design is very clean and modern and more responsive. )