i use a mac computer and on a pc there was a slight difference in the output

so i need to use a separate stylesheet for a mac and pc so that whichever areas there are differences i can have a separate css file and write code only to those areas that need to be fixed but the general style would be in a global file called style.css

i am using the method at
http://www.dynamicdrive.com/dynamicindex9/dyncss.htm

and this works fine is this the best method to go about or is there a better and efficient way

please advice

thanks