[Problem] chapter "jumping" up and down while reading

Reading any novel, any chapter

In the webpage we have the menu, the ad and the chapter, the ad changes every X seconds and sometimes it can disappear, because the height of the ad is not fixed then if the ad disappear the chapter will jump up (if I was in the middle of the window reading the line 50 of the chapter now this line will be up in the start of the window), the ad can reappear later and the chapter will jump down.

I am using safari Versión 12.0.2 (13606. on a mac pro sierra 10.13.6

Ads need a min height so that chapter will not jump up or down if the ads fails to load.
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