WooCommerce Customization

I’ve added the following shortcode to my wordpress site:

[add_to_cart id=“10331″ show_price=“false“ style=“border:0;“]

What I want to do:

– Align center (it moves around like crazy as soon as I re-size browser page
– change colors (button and text color are blue)
– Change the icon that appears as soon as I head over the button with the mouse (a number ‚5‘ is shown.

Thanks for your help