Problem with a test

CSS Flexbox: Add Flex Superpowers to the Tweet Embed

My code is correct, but still the test says that: Your .follow-btn should have a display
property set to flex .

Here is my code: header .follow-btn {
display: flex;
margin: 0 0 0 auto;

I understand, it must be a bug, but how I proceed to the next task?
Will be grateful for any help

Upd. Found a bug report. Sorted. Thank you.

Thank you very much, it was indeed caused by my ad-blocker. I am through now.