how to Customize the individual tabs of a tabsheet??


I have a query of how to customize the individual tab of a tab sheet.
For example: I need to give different colors for different tabs and also needs to adjust the width and height of the tab individually.
I tried with .v-tabsheet-tabitem-minitabs. When i apply this minitabs style to that tab it is not getting reflected.
Please help me on this.

I ma able to put it as .v-tabsheet-tabitem .v-caption{} but i couldnt put .v-tabsheet-tabitem -minitabs .v-caption{}. Why is it so???

Thanks and Regards,
Shankari G R