On the right.. is there a way to prevent this?
Please always attach a link to your website so we can check it out. If the page is offline(localhost), then our help will be limited. You will have to contact us when the page is online. Also, please make sure that the page is not under maintenance before you provide us with the link.
Please, go to Betheme -> Theme options -> Footer, and in the background, section set the size to Cover or Cover, on ultrawide screens only.