Using background images makes pages more attractive.
A standard Splash Portal page is composed of the following sections:
- App Bar
- Main container
In order to add a background image to the "header" section of the Splash Portal, it is necessary to access the Splash Portal section, click the Splash Portal where you intend to set the image, then click the Settings button and subsequently upload the image to the Header Background input.
You can learn more about this by reading the article Setting appearance, languages and public URLs for your Splash Portal.
Note: the image above refers to a Splash Portal where the trick of having a transparent App Bar has been used. Please see Make the App Bar background transparent.