Problem: Adding a bootstrap app inside a page viewer web part in SP2010 causes the formatting to be messed up.
Reason: SP 2010 does not have the right compatibility mode required on the master page.
Solution: Open the site in SharePoint Designer
Copy the v.4 master page for the site to a new master page and add the following line as the first “meta” tag:
<meta http-equiv=”X-UA-Compatible” content=”IE=10″ />
Click save as default master page on the ribbon. Keep in mind this applies to all pages to the site.