header{
	width: 100%;
	height: 750px;
	background: #7BF2DD; 
	background: -webkit-linear-gradient(to right, hsla(280, 51%, 60%, .6), hsla(194, 57%, 55%, 0.47)), url(https://tecnologiadelfuturo.es/wp-content/uploads/2020/09/inteligencia-artificial.jpg);
	background: linear-gradient(to right, hsla(280, 51%, 60%, .6), hsla(194, 57%, 55%, 0.47)), url(https://tecnologiadelfuturo.es/wp-content/uploads/2020/09/inteligencia-artificial.jpg);
	background-size: cover;
	background-attachment: fixed;
	position: relative; 
}