Shopping cart drop down menu

Hello.

I have a "problem" with the drop down shopping cart on my website.
Visiting my website on a computer, I have the cart icon on the left side of the header and the same icon is on the right on mobile devices. This is fine for me, but,
1. When the icon is on the left, the drop down cart menu is half hidden out of the screen. Can you, please, help me to solve it? I'd like it to be aligned at the left of the icon.
2. On mobile devices there isn't a drop down menu on the cart icon. Could you help me to fix it? I'd like it to be shown just like the one on computer devices but, as you can imagine, on tye right hand.

Thanks,
Silvia