add to cart button dropdown not working?

I used oc 2.3.0.2 and i have a problem with my add to cart button.
my product successfully add in cart but when I click on add to cart button nothing to show and add to cart button not clickable.
I have checked all the possible method from google but i cannot solve the problem.
my website link is https://cakegift.in,please help me.
Thanks in Advance.

Well, your problem would possibly not exist, if you try to do this by use of the
OC Default Theme, but the MEGNOR Theme does much of this in it's own way,
you therefore better get in contact with the Theme Seller, to find out about.
Good Luck
Ernie
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Thank You...class is removed by mistake.