You can customize the images that the cPanel & WHM login theme uses. These images exist in login theme's
If you customize a login theme, make certain that your custom images use the same dimensions as the default theme's images. These dimensions allow for the correct amount of padding within page containers.
Subheader logos appear at the top of the login pages for cPanel, WHM, and Webmail.
The default cPanel & WHM login theme contains the following subheader logo images:
The default cPanel & WHM login theme contains the following additional images: