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Dealing with CSS issues in Amazon Cognito can be frustrating, especially when trying to customize your login pages. A common problem happens when you try to add custom styles using the ::after { content: "…"; } rule. It just doesn’t work, and understanding why can help you find the right solution.
The main reason for this is that AWS conducts strict validation and sanitization of your CSS files during upload. When you add a CSS file to Cognito, the system runs checks and removes any properties that are not explicitly allowed. This is done to protect security and keep the user interface consistent.
Specifically, the content property used with pseudo-elements like ::after is stripped out. Even if your CSS file passes the upload process without errors, the styles will not appear on the frontend. This is why your attempt to add custom text or decorative elements with pseudo-elements often fails.
The key takeaway is that the Classic Hosted UI has reached its limits in customization. If you want more flexibility, you have two main options:
First, you can upgrade to the newer Cognito “Managed Login” UI. Although it doesn’t support inserting custom HTML directly, it allows you to easily add links to your Terms of Service and Privacy Policy. You just set these URLs in the App Client settings, and Cognito automatically includes them as clickable links in the footer. This approach is simple and saves you from complex coding.
Second, if you require very specific features — like custom text that isn’t supported, or a unique layout — building a custom user interface is the best way. You can create your own login pages using Amplify or SDKs, giving you the full control you need to match your branding or functional requirements.
Choosing the right option depends on your needs, but the managed UI upgrade offers an easy and effective way to enhance your login experience without dealing with CSS restrictions.
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