CSS for Sidebar/Navigation Bar Position

I am hoping someone can help me with the CSS code for the sidebar positioning. I need it on the left side, and the widget only places it under the header, but I need to move it down to place it on the left side under the hero image, which is under the header and quite large.

Can anyone help me out with the code for that or direct me to where I can find it or figure it out? I appreciate it so much.

The page I need help with: [log in to see the link]