Theme – Displace left sidebar nav becomes horizontal

I am using the Theme Displace. I customized the css but something went wrong with the layout of the 2 columns. They appear to be separated and doing their own thing particularly when I move the brower window to make it larger. it seems that the verticle left nav bar is pushing against the content area which moves to the right and the left navigation then becomes horizontal with a width that spans the entire browser. I would like the theme to act like it is supposed to but do not know what I did wrong. Maybe it should be wrapped. It’s not and I tried adding the #wrap into the css but I don’t know how to add a div to the html and I don’t know php. I would appreciate if someone could help me fix it. Thanks Here’s the link:
outonalimbexotics.com/blog/