How to apply custom CSS for password protected links
You can customize the appearance of a password protected short link.
Follow the instructions below:
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Sign in to your Short.io account.
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You can access the CSS settings for a domain in one of the two ways:
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by directly navigating to the Domain settings -> UI Customization:

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by clicking on the Customize CSS link in the Password protection section when editing a link:

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Enter your CSS code and click on Save.

The next time you access your short link, you will be able to see the new appearance of the password page:

For more examples on CSS customization please review the following article: Custom CSS examples for password page