The abbrivation of CSS is Casecading
stylesheet. Bye using this You can change the appearance of an entire site
by editing one style sheet..Here is complete course of CSS3 with detail.
We hope you will enjoy it.
There are many text editors for html editing.
Some of them with there link are mentioned bellow.
My fevourite text editor is Sublime.
TextPad is useful for coding of HTML.TextPad
Sea monkey is free for HTML coding CoffeeCup
NodePade++ is very nice editor for html NotePad++
How to save CSS3 file ?
Save the file of html using .css extension in any text editor.
Here is the demo of saving CSS3 file using sublime text editor.