ad pops up on my safari browser while on my iphone 6s+ and takes over the page ;-(

[robfilms]

i'm browsing espn on my iphone 6s+.

suddenly an ad pops up telling me i can win an amazon gift card.

i cannot delete the ad page without deleting espn.

no prob.

i delete the ad page then close safari the re-open safari and go to espn.

i'm good to go for awhile.

then suddenly the same amazon gift card ad pops up.

how did this trash get onto my iphone 6s+?

i believe i am running ios 12.1.2

the website can be seen at the top of the ad page.

it is called:

cardcentercimbniaga.world

how do i rid myself of this pest?

thanks in advance.

thumbs up.

rob