header{
	width: 100%;
	height: 750px;
	background: #7BF2DD; 
	background: -webkit-linear-gradient(to right, hsla(201, 60%, 66% 6), hsla(142, 60%, 66%, 0.47)), url(https://www.fuegoyamana.com/wp-content/uploads/2017/04/aplicaci%C3%B3n-web-y-de-escritorio-01.jpg);
	background: linear-gradient(to right, hsla(201, 60%, 66%, .6), hsla(142, 60%, 66%, 0.47)), url(https://www.fuegoyamana.com/wp-content/uploads/2017/04/aplicaci%C3%B3n-web-y-de-escritorio-01.jpg);
	background-size: cover;
	background-attachment: fixed;
	position: relative; 
}