Change submit message font on Promotional Pop Up

Hello, I want my post submit message font on the Promotional Pop Up to be styled with Proxima Nova & to be bold as seen in "correct font & style screenshot".

I have tried the settings available in pop up. I have also tried this code, but it's not working

// Paragraph font pop up //
p#sqs-slash-page-header {   
font-family: Proxima Nova !important;}

https://www.magickembodied.com/

Please can you send me the fix for this?

Thank you

The correct font is the first one, where the browser window says private in top left.

Thank you. This is the result - which did not fully work...

Please can you help me fix?

I see now, I was supposed to delete the input field of the message (and add my own css for bold & white font)

Thank you