Top navigation overlap issue with page viewer web part(Iframe) in SharePoint 2013

Hi All,

I'm using page viewer web part to display power view reports in a page. And created top navigation links for these pages(Site Settings->Navigation->Global Navigation links).

Issue: When I open the page which has Page Viewer web part, then try to open the top global navigation dropdown. Top navigation menu is overlapping with the page viewer web part page content. If I open any other pages, which does not have page viewer web part, in this case top global navigation works fine(not overlapping with page contents).



Additional Information:

Share Point 2013 - Business Intelligence Center site template



Can some one help me out to resolve this issue. I appreciate your valuable time.



Thanking you in advance,
Regards
Seva