.alpha{
	position:relative;
	left:45%;
	background-color:pink;
	display:inline-block;
}

.beta{
	position:relative;
	left:45%;
	display:inline-block;
	background-color:red;
	background-width:900px;
}
.gamma{
	position:relative;
	left:45%;
	display:inline-block;
}