.yellow {
	background-color: #ffcc33;
	margin: 10px auto;
	width: 550px;
}
.blue {
	background-color: #66ccff;
	margin: 10px auto;
	width: 550px;
}
.yellow2 {
	background-color: #FFFF00;
	margin: 10px auto;
	width: 550px;
}
.blue2 {
	background-color: #84daff;
	margin: 10px auto;
	width: 550px;
}

a.img:link    {color:#000000; text-decoration: none;}
a.img:visited {color:#000000; text-decoration: none;}
a.img:hover   {color:#000000; text-decoration: none;}
a.img:active  {color:#000000; text-decoration: none;}

#einstein
{
width: 550px;
text-align: center;
margin: 10px auto;
}