Using this tutorial (http://docs.shopify.com/support/your-website/themes/how-to-add-a-pick-an-option-to-drop-downs) I noticed it does not work on mobile websites - safari, chrome. On desktop ...

I'm not a tech wiz please help!! I have two variants for most of my products - size and color. I want to force my customers to select a variant so I give all my products a du...