ITSM: Change the Image of IT Agentic Banner in Aura Sites

This can achieved by uploading a static resource and use custom CSS on the site.

1. Uploading a Static Resource :

• Go to setup and search for 'Static Resource'.
• Create a new static resource with the 'Name' (example: Banner) and upload the image. 
• Set the Cache control to 'Public' and save it.

2. Use the custom CSS :

• Go to the experience site builder.
• In the Edit Head Mark up under the Advanced settings add the below css 

<style>

 .heroBannerContainer {

   background-image: url('/sfsites/c/resource/Banner') !important;
   background-size: cover;
   background-repeat: no-repeat;
   background-position: bottom;
   height: 300px;

 }
        
 </style>

This way you shall be able to make changes to the image on the IT Agentic Banner.