.header{
	background: url(../img/machine-bg.jpg) no-repeat;
}
#sistemas {
		background-image: none;
	}
/*.ios img {
	margin-left: 2em
}
@media screen and (max-width: 480px){
	.header{
		padding: 20vh 0;
	}
	h2 {
		font-size: 25px
	}
	#realidad-virtual img{
		width: 50%;
		margin: 20px auto;neurona
		display: block
	}
	#sistemas img{
		width: 90%;
		margin: 20px auto;
		display: block
	}
	#desarollo-apps img{
		width: 60%;
		margin: 20px auto;
		display: block;
	}
}
*/