div.divBlack300px{
	background-color: black;
	width: 300px; height: 300px;
	margin: auto;
	border-top: 1px solid black;
}

div.divRed50px{
	width: 50px; height: 50px;
	background-color: red;
}
	

/* button white on red */
button.btnWhiteOnRed {
	color: white;
	background: red;
	padding: 5px;
	display: block;
	margin: 10px auto;
	border: 1px solid white;
	border-radius: 5px 5px;
}

/* demo - css transitions animation*/
div#demoCSStransitions_redDiv{
	margin-left: 0px; margin-top: 0px;
	transition: margin-left 1s, margin-top 2s;
}