[CSS] How to use Class

Example:

.Happy .yes .good{

   BACKGROUND: url(happy_header.png) no-repeat; MARGIN-TOP: 55px; FLOAT: right; MARGIN-RIGHT: 55px

}

 

<DIV class=Happy>

    <DIV class=yes>

       <DIV class=good>



CSS teach :

Here are 3 level Class.

<DIV class=Happy>

    <DIV class=yes>

       <DIV class=good>



So CSS have 3 step to describe it. like .Happy .yes .good



Picture must put same fold with CSS file.





<DIV id=ethernet>

      

</DIV>

#ethernet {

    

}

If use div id

CSS use # to mean represent id name