Shop doesnt work at mobile

Hi:-),

My website is responsive (Artificer theme with WooCommerce webshop). But since one month the page of my webshop (http://fair-hip.nl/winkel) doesn’t work on mobile anymore.

I think it is because of the backgroud/image of the search function but I don’t know that for sure and I also don’t know what I can do to fix it ( I already tried a lot).

I hope that somebody here can help me out:-)!