Cant override css

[webss_studio]

Hi folks, ive read several topics about custom css etc. in virtuemart but none of these works.
I have completly no idea how to override virtuemart css, i dont want to turn them off but changing folder doesnt work, so this forum is my last chance to make it work.
I have attached screens of items i want to modify, can you give me some tipsto simply do this.
Greetings

PS, example item shown in attached pic is modified by code of vm css file, my custom css is not working, when i placed this file in my template css folder and turned off vm css they are not wroking...

[jenkinhill]

See http://docs.virtuemart.net/tutorials/templating-layouts/106-override-vmsite-ltr-css.html   - note that the css file is named vm-ltr-site.css in VM3 but the princiles still apply.