changing background in some easy social modules

Hello guys.

Could you helpme with tellingme where can i change the background of this modules. Actually i have changed the main background and this modules could be seeit better if they have a white colour background, so if you could helpme tellingme where or change for me this backgrounds i will appreciate it.

I let you images of the modules which i need to change it´s backgrounds. is marked with or surrounded with a blue line.

Let you the admins acces too, if you could take a look.

This are the url´s where you can find this:
http://aulapro.co/directorio/index.php/community
http://aulapro.co/directorio/index.php/community/registro

Regards!