1. Log in to your WordPress dashboard: www.yoursite.com/wp-admin
2. Click on the Appearance tab in the left navigation
3. Click on Background
4. Under Display Options, click on the Background Color tab
5. Drag your mouse over the color board to select the color you want, and click Save Changes
6. Refresh your website. Simply use trial and error by repeating steps 4 and 5, until you’re happy.