Sidebar Not Displaying Properly on Homepage

Hello,

I am working for the website : regionalhotties.com

The original theme includes only display blocks in the home page but i added sidebar. Now sidebar is displaying correctly for high screen resolution monitors like 1600*900 or `1920*1080 but it is not displaying properly for small screen. You can check my website on various screen resolution using testsize.com

Any guide on how to fix it on small resolution screens?

Thanks