The shopping cart appears in one horizontal line in Safari (that’s what I want) but not in FF or Chrome. See here. I’m assuming there’s a <div> that needs a few more pixels, but can’t seem to target it with css.
Also, my page is responsive and the cart is not dropping down to the next line in FF/Chrome when I close my browser to 800px.
As far as the width goes, that depends on your theme, not the menu cart plugin. What’s happening is your theme is designed to implement the responsive settings at a specific page width. If you want to insure everything stays on the same line, you’ll need to reduce the size of the menu items, remove a menu item, or modify your theme’s css to make it implement the responsive css a wider width.