Advertising » Keep on getting pop up ads in mobile safari

Hello,

I will be surfing a website and some win a gift card window pops up. It is not easy to just swipe it away but you have to hold the back arrow.
Very irritating. Frequency has been increasing now it is at least once a day.
I have cleared the browser a few times but that does not work.
How do I get rid of this?

Any help will be apprecited.
I didn't find the right solution from the Internet.

References:
https://arstechnica.com/civis/viewtopic.php?f=9&t=1419003
Digital content production agency

Thank you