JEM Management Calendar Module days colors

Hello,
I use the JEM Management Module calendar to place it on a particular position.
Is there a way to change the colors ? As an example the background colors for the present day, for the days when an event occurs etc...
I wonder if it is possible..

Thanks for help.

please use a development element, like in firefox firebug, there you can find where and which css you have to change to change colours of today and days with events...

Thanks for your answer.
I thought there was another solution.. but i used ths one you have suggested.
It works as expected here: lesamisdecoetcandec.fr/

Regards