Force Refresh Cache at Visitors Browser

Hello.
Very often I am changing css code but ok for me I can make a refresh to my browser and see the changes BUT I cant find a way to force a Refresh to ppls visit my site to get the new css changes .

I have search internet I see some tricks about having css with some kind of version . But I dont think YouJoomla framework supports this .

Is there is any way to force refresh of the changes to my visitors browsers?
Thanks

Are you sure your are posting in product assigned forum?: Yes

What is your CMS version?: Joomla 3.x

MySQL Version: 5.x

PHP version: N/A

Link to installation: www.youjoomla.com

Have you edited any files? If yes tell us which ones.: No

Is this personal or client website?: Personal