Applying some css in my stylesheet form some other existing style

Question

I am trying to apply css from some other existing css, In my style sheet

I have a css

  .baseColor{
  color: red;
  }

now in my other css , i dont want to assign a hardcoded color , instead i need to use the same color whichever is in baseColor..

 .buttonColor{
 color: (What ever is in baseColor)
  }

 .tabColor{
   color: (What ever is in baseColor)
  }

is this possible