how to createe a css class

create a folder for stylesheet(say name as StyleSheet) under that create a stylesheet template
(say name as Website.css) create the class as per your requiremant inside template. say:
.text3
{
    PADDING-RIGHT: 10px;
    PADDING-LEFT: 5px;
    FONT-WEIGHT: normal;
    FONT-SIZE: 12px;
    RIGHT: 0px;
    LEFT: 0px;
    PADDING-BOTTOM: 3px;
    WIDTH: 0px;
    CLIP: rect(0px auto auto auto);
    COLOR: #000000;
    BOTTOM: 0px;
    PADDING-TOP: 5px;
    FONT-FAMILY: "Trebuchet MS", Tahoma, Arial, Helvetica;
    TOP: 0px;
    HEIGHT: 0px;
    TEXT-ALIGN: left;
    TEXT-DECORATION: none
}

Now u want to use class text3 in your web page.
Follow the steps given below:
Refer the stylesheet folder in your html page of website under
tag.As follows:

Now u can use the text3 class which u have created under stylesheet as follows

  
        
              Name :
         
    

            

verify this link

      http://www.w3schools.com/css/css_intro.asp

 first u can learn this topics,it is very helpful to u than u will try for code.