Blurry screen after click signup for course

Hi upon clicking signup button the screen becomes blurry

https://postimg.org/image/jvf8uomdt/

http://seo-splash.co.il/nitza/courses/%D7%A7%D7%95%D7%A8%D7%A1-%D7%A8%D7%90%D7%A9%D7%95%D7%9F-copy-copy/

please assist

thanks