You can change the default login theme for users which displays when they log into cPanel, WHM, and webmail.
Login to your WHM root account.
Tweak Settingsor type, “Tweak Settings” in the search box and then the option will appear. Click on it.
Under “Tweak Settings”, click on the
Displaytab and then choose the theme you wish to activate.
Scroll down to the end of the page and then click the
The new login theme will be applied successfully. You can verify it by visiting your cPanel, WHM or Webmail login page.