Yes no problem, set the width of your website in the template, step 1 general settings, template style -> template structure, click on the header, this defines the width of your site. And you can change it on the left below to your own liking. Just beware of your visitors if it's too width you need to start scrolling, not every user has a pc with a high resoltution monitor. So keep in mind that it looks differentle, or use yourself other resolution to see  a good end result.