*{box-sizing: border-box}

html{
	background-color: gray;
}

header{
	text-align: center;
	background-color: lightgray;
	border: inset;
}

body{
	border: inset;
}

.row:after{
	display: table;
	content: " ";
	clear: both;
}

.left{
	border:outset;
	border-radius: 25px;
	float: left;
	height:400px;
	width: 25%;
	padding: 5px 20px;
	background-color: salmon;
}

.content{
	border:outset;
	border-radius: 25px;
	float: left;
	text-align: center;
	height: 400px;
	width: 50%;
	padding: 5px 20px;
	background-color: tan;	
}

.contentMusk{
	border:outset;
	border-radius: 25px;
	float: left;
	text-align: center;
	height: 400px;
	width: 50%;
	padding: 5px 20px;
	background-image: url("elonmusk.jpg");	
}

.right{
	border:outset;
	border-radius: 25px;
	float: left;
	height: 400px;
	width: 25%;
	padding: 20px 20px;
	background-color: lightblue;
}

.footer{
	border:inset;
	float: static;
	height: 150px;
	padding: 25px;
	background-color: lightyellow;
}