body {
	background-image: url(img/pepita.jpg);
	background-size: 20%;
}

@media (max-width: 1600px){
	body {
		background-size: 25%;
	}
}

@media (max-width: 1200px){
	body {
		background-size: 33.333%;
	}
}

@media (max-width: 800px){
	body {
		background-size: 50%;
	}
}

@media (max-width: 400px){
	body {
		background-size: 100%;
	}
}