Plugin Hacked my website ?????? Please advise

Today I have checked my website (polishstudent.co.uk) and at the bottom on all webpages I noticed an add. Very strange as I have not put any ads there – not my ads. It shows up on all pages. I disabled some plugins like ‘Magic Ads Widget’ but it is still these. This are google ads. I have no idea how to remove it.

Could someone please check my website and advise me on this ?