*{box-sizing:border-box;}
body,html{margin:0;padding:0;}
.principal{
	border: 1px solid red;
}
.contenedor{
	border:1px solid red;
	width: 100%;
	height: 500px;
	padding: 1%;
	margin: 0 auto;
}

.cuerpo{
	width: 70%;
	height: 300px;
	margin-left: 1%;
	border: 1px solid red;
	float: left;
}
.cuerpo>h1{
	text-align: center;
}
.dentroizq{
	border: 1px solid red;
	float: left;
	width: 20%;
	height: 100px;
	margin-left:20%;
	padding: 1%;
}
.dentroder{
	border: 1px solid red;
	float: left;
	width: 20%;
	height: 100px;
	margin-left:20%;
	padding: 1%;
	



}
.parasito{
	border: 1px solid red;
	float: left;
	width: 25%;
	margin-left: 2%;
}