body {
  background-color: gray;
}

.Class_Box_1,
.Class_Box_2,
.Class_Box_3 {
	position: absolute;
	color: white;
	background-color: violet;
	width: 900px;
	height: 100px;
	font-size: 30px;
	font-weight: bold;
	font-family: Arial, Helvetica, sans-serif;
	text-align-last: center;
}

.Class_Box_1 {
	top: 100px;
	left: 50px;
}

.Class_Box_2 {
	top: 300px;
	left: 50px;
}

.Class_Box_3 {
	top: 500px;
	left: 50px;
}