body{
	margin: 0;
	padding: 20px;
	background: lemonchiffon;
}
iframe{ 
	width: 100%;
	max-width: 800px;
	border: solid 1px gray;
}
fieldset{
	background: lightyellow;
	border: 1px dashed gray;
}
h3{ margin: 0;}
div{ margin: 20px 30px;}
code{
	color:blue;
	font-size: 15px;
}
button{
	margin: 5px;
	color: white;
	background: royalblue;
	border-color: midnightblue;
	border-radius: 3px;
}
button:hover{ transform: scale(1.03);}
button:active{ transform: scale(1.0);}