You can set a background color for individual content blocks within your newsletter through the block settings. However, there isn’t currently a way to set one overall background color for the entire newsletter.
Keep in mind that background colors may display differently in the editor compared to how they appear in various email clients (like Microsoft Outlook). This is due to differences in how email HTML is rendered across clients—an industry-wide limitation, not specific to Frontify. Some email clients may also remove certain styling elements, such as background colors, for security or compatibility reasons.