You can use our Theme Chooser feature to customize the color of your app to match your branding. In the editor, you'll see the button to show the Theme Choose at the bottom left, just above the Publish or Preview button. Go ahead and click it:
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Clicking the color wheel brings up a color selection tool where you can either select a color you want, or type in a Hex code to match an exact color.

You can also flip between the "Light" and "Dark" theme.
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These theme changes apply to your entire app, except the Cover, which has its own settings.

Note: We suggest you stay away from white/near-white background colors.