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Nigel RodriguesNigel Rodrigues 

Vf page on page layout not displaying to 100% width in Lightning

I have a vf page in a section on the page layout. When I try to view the page in Lightning, the vf page does not fit exactly i.e. fits to ~80% of the section. I tried using <div> tags, etc. but that didn't work.

If I include the same vf page in a Vf component on the Lightning record page, it displays perfectly using up the full width. Is this a bug?