Remove White Bar at the Top

Hey, could someone have a quick look at my first page to tell me how to remove the white bar at the very top of the page? I searched the internet, tried typing in Codes into CSS, but nothing works.
Thanks in advance!
Website: https://mytreasureworld.com/

Hello there,

Hiero theme doesn’t add such that content at the most top. Probably it comes from some where else. You may want to check your active plugins or child theme.

To force remove it, add this CSS code to Appearance > Customize > Additional CSS from dashboard.

body > p:first-child {
  display: none;
}

Regards,
Kharis

Thanks for the answer. Unfortunately, nothing works…The Code changes nothing when adding it to Additional CSS