Layout width for cart plugin and remove product links

I am trying to update the CSS to change the width for the cart widget on the page linked below. It seems the .mp_cart_contents is set at a width of 770px. I have tried all the css comands I could think of but still can not get it to change. I want to change the spacing to make everything a bit smaller. I would love to have the width set around 400-500px. Any recommendations?

I am also wondering if there is a way to remove the product links (mp_cart_col_product_table) once an item has been added to the cart?

http://dev.aaie.net/events/annual-conference/

Thanks!