We have used DB method to migrate from 2010 to 2016. 

Font colors – original site most leading text is black or dark blue. On the migrated site it is faint almost transparent grey. White text on blue fill banner for NDA restrictions is now grey.
Please see in below screenshots. Why it happened? Please help.
you can see "page not foud " in 2016 But not in 2010. Please see following screeshots. & you can also what happens when click on page not found


What if I want pdfs to open in Acrobat?
Please help on above three issues.

