Plugin's form styling (CSS)

I have installed a plugin called WooCommerce Request a Quote, the form generated by the plugin looks great when Twenty Thirteen theme is active.

http://s17.postimg.org/moz80txof/image.jpg

My site uses uDesign theme, this theme shows the form as follows :

http://s17.postimg.org/6s0g445a7/image.jpg

Can someone kindly help me fix the styling problem?

Thank you in advance