Hi @Renu4 ,

You can change the background color and image of the Service Portal in the Service Portal Designer by following the steps below.

1. Make sure you are in the Global application scope
2. Navigate to Service Portal > Service Portal Configuration
3. Click Designer
4. Use the filter to find the Service Portal "landing" page and open it
5. Select the outermost Container
6. Click Edit (the pencil icon)
7. Change the background color in the Background color field or upload an image in the Background image field
8. Click Save

A walkthrough of the steps to change the background color or background image of the Service Portal is also available in the following video (see time 03:20😞

https://www.youtube.com/watch?v=FYRI1Kufz4w&t=201s

If I could help you with your Query then, please hit the Thumb Icon and mark it as Correct !!

Thanks & Regards,

Sumanth Meda