nfg_day1


 * Ex.1**

code format="html" <!doctype html>

 width:100px; height:100px; position:absolute; left:100px; top:100px; background:red; }
 * 1) bob{

background:orange; border:3px dotted green; }
 * bob:hover{

background:yellow; width:110px; left:500px; }
 * bob:active{

code