Where can I adjust the CSS for the Archive popup?

H1 font is too large but everywhere I try to insert CSS it doesn't make a difference.

Hi,

The popup form is using a <p> tag. So I guess you have used a custome field that you have added to the popup form? If that's the case you can use inline css like this:

<h1 style="font-size: 20px;;">Title</h1>

8 days later