Q.How do I change the background of the welcome page?

CSS must be used. As the stylesheet at Design → CSS is not loaded on the welcome page, CSS code must be added at the metatags page at Marketing → SEO (Global). Copy and paste the following text in the Header field:

<style type="text/css"> 
.intro_page_body { 
  background-color: #000000; 
} 
</style>

Replace the #000000 in the above code block with the color hex code of your choice. To add a background image, use the following text instead:

<style type="text/css"> 
.intro_page_body { 
  background-image: url (https://example.ocnk.com/data/example/image/~~~.JPG); 
} 
</style>

Replace the URL (https://example.ocnk.com/data/example/image/~~~.JPG) in the above code block with the image URL you desire. Please ensure that you use an absolute path URL starting with http:// or https://, depending on your settings at Basic Settings → Global HTTPS settings.