problem with heading custom css

Hello,
I inserted a heading field in a registration form and I would like to style it. I added the "giulia" class in the css class option of the heading field.
Then, in EB configurations -> custom CSS I added

.giulia {
color: red;
font-size: 9pt;
}

but nothing happens.
Can you please help me? I suppose I'm doing something wrong.

Thanks

Hello

For this, we will have to check it directly on your site. Could you send us link to the page and tell us the field you want to apply that custom css code so that I can understand and check it further?

Regards,

Tuan