iOS iPad Fixed position breaks when keyboard is opened

• http://stackoverflow.com/questions/14492613/ios-ipad-fixed-position-breaks-when-keyboard-is-opened

Fixed element issue:

• http://dansajin.com/2012/12/07/fix-position-fixed/

Bootstrap modal issue:

• https://github.com/twbs/bootstrap/issues/9023
• http://www.abeautifulsite.net/bootstrap-3-modals-and-the-ios-virtual-keyboard/