I'm looking for a way to create a CSS injection proof-of-concept. I can insert the following and it gets reflected in the browser:


The only issue is that the colon gets URL encoded, which prevents the css from rendering.

The reflected output looks like this:


I've tried common XSS attacks, but a WAF seems to block most event handlers.

Is there a way to get CSS injection without the colon or with an alternative character?

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