[This page contains both secured and unsecured items]

The pop-up message asks if you would like to print the page because the https security protocol was called in the address bar, but the page you are trying to call contains an unsecured http page.
If you do not want to display this pop-up, do not mix http pages with https call pages.
 
If the page you want to call from the https protocol has a source or page called from the http protocol, please use a relative path.
If you do not call the image source or media source directly from the http protocol web path, but enter a relative path to avoid protocol conflicts, you will be able to check the [lock mark] without related pop-ups.
Also, there is no need to encrypt the entire packet in the format https://domain.com from the first page.
 
Please note that you can only apply this to the packet-related pages (login, sign-up) that need to be encrypted to avoid problems with intentional access.