Double level mega menu

HI,

I wanted to insert you Mega Menu Widget in the html block of my menu,

to make a double level megamenu like on shop section of http://pandco.com

But I can’t get it stylised as I want …. it’s good in visual composer (image2) but everything move on the online page (image1)….

ANy idea to make it works or do it an other way ?

Thanks