Log in as an admin
Go to Site administration > Appearance > Themes
Edit the Classic theme's settings.
Set a background image. Use whatever image you like.
Save the changes
Switch the site's theme to Classic
Go to Site administration > Appearance > Navigation
Set the " Start page for users " (defaulthomepage) to " Home " and save the changes.
Open another browser session.
Log in as a user.
Confirm that the welcome message is now in a container with a white background.
Repeat the previous steps with the " Start page for users " set to " Dashboard " and " My courses ".
The new welcome message is not accessible when there's a background image on the page.