Search box background conflict

hi
I am trying to use WP-INSERT. After inserting Ist ad unit (search) in right side bar widget area, the background color of search input box is white (as i wanted it to be).

However, after inserting IInd ad unit (160×600) in right side bar widget area the background color of search input box changed to red.

You can see this at following URL:
http://www.concretebasics.org/cb/testads/

May be, there is some conflict somewhere…

Would be nice, if you can see this and let me know how to resolve this. I want the background color of search input box changed to be white (back ground color of search button should remain red) . Which particular element should i target?
thanks

https://wordpress.org/plugins/wp-insert/