Give your background a splash of color by following these steps to modify the transparency and shades of your background:
1. Select Design in the navigation bar, and locate the page you'd like to change the background color for. On the right-hand sidebar, select the Page tab.
2. Click on the content block you want to change.
3. From there, find the Container drop-down option near the bottom.
4. Click on the colored box to select your shade, and drag the opacity scrollbar to select your opacity level. (Background colors with decreased opacity can show a custom image background underneath it)
5. Choose Save and then Publish to make it live!