Without css file you can’t see a web page/site, if css file is huge it makes web site load slow, so what to do?
how to Optimize your css code?
There are various way to Optimize your code, firstly you can do it manually using short hand css properties how every i am not explaining about it because you can get info from this links
Using Css Sprites
CSS sprites allow you to create a single image file that contains all the images laid out in a grid, requiring only a single image and you can show respective image using backgroung-postion property…
For more info
Online Css Sprites Creator
It also displays code for background postion for image for each image.
Will this tips reduce css file size, yes no doubt in it
Note: Don’t forget to validate your style sheet