No problem at all.  With very few exceptions our templates are designed to accept color changes.  Just go to your Control Center, select the "Edit Colors & Styles Site-Wide" icon, and make the changes you want.  In the case of some designs you can also select from pre-made color schemes made especially for your design that will change the whole color look of your site with a couple clicks. To access color schemes for your template design go to your Control Center and click the "Template Color Schemes" icon.