Improvements on main.html content posts

Issues:

Main.html

1) trying to make a "content-wrapper-header" div to push the content
down but not sure why it's not showing up

2) left nav when clicked on should push all content to the right and
also be able to go back when clicked outside of the menu area

index.html

1) can't center the mobiledevices image

2) not sure how to get rid of styling on the enter button