I see a small square with an X on my published page, not on my site editor, how do I delete?

I see a small sqaure with an x on published page, not on my editor.  I tried the "Control tap A" and that didn't work.  When I inspect it, it shows as element 266.  Would love to find it and delete, whatever it is!  It is on this page under "Equine Challenge On Demand Feeding Instructions"
http://equinechallengeproducts.homestead.com/~local/~Preview/EquineChallengeOn_Demand_Products.html  Thank you!!