Move the widget icon a bit higher in bottom right

Thank you for great plugin. I have not got any issues yet but I am having appearance issue.

I am using Storefront theme in Woocommerce. The tawk.to widget is directly over the ‘My Cart’ button on mobile devices. Is there some way to move the widget a bit higher on mobile devices and make the icon a bit smaller ? ( https://drive.google.com/file/d/0B3FBa0yT26zhZGhVdTlXcldodlE/view?usp=sharing )
I have attached screenshot of problem and new location and size which would be best for me.