body{
	margin: 20px;
	background: url(sky.jpg);
}
code {
	font-family: Helvetica, sans-serif;
	font-weight: bold;
}
div {
	padding: 15px;
	border: 10px solid #ffffff;
	background-color: #00cc99;
}
#sample00 {
	opacity: 0.0;
}
#sample01 {
	opacity: 0.1;
}
#sample02 {
	opacity: 0.2;
}
#sample03 {
	opacity: 0.3;
}
#sample04 {
	opacity: 0.4;
}
#sample05 {
	opacity: 0.5;
}
#sample06 {
	opacity: 0.6;
}
#sample07 {
	opacity: 0.7;
}
#sample08 {
	opacity: 0.8;
}
#sample09 {
	opacity: 0.9;
}
#sample10 {
	opacity: 1.0;
}