[Cosvo]

Hey.
I am just trying out something, and I am all in one very new to web designing.
I set my website margin on right and left 20% and made the max-width 60%. But when I placed in border into my css file: 5px solid black; it goes out of the max-width on the right side. What do I do?

Here's screenshots.

Website: http://i.imgur.com/WkwTg9s.png
Html: http://i.imgur.com/J6GhU50.png
Css: http://i.imgur.com/irZDbhv.png