Background transparent?

Hi, the problem I have is that the widget seems to ignored the color scheme, well not ignore but when the widget in the body.plugin,it activates the background transparent and it takes the footer background color, here is the link http://www.pruebas.dendral.mx, any ideas why is this happening, the theme used is this one http://themeforest.net/item/automotive-car-dealership-business-wordpress-theme/9210971.

https://wordpress.org/plugins/facebook-by-weblizar/