body { background: url(img/background.jpg) no-repeat center; background-size: cover; min-height: 100%; }
#logo { width: 500px; }
@media (min-width: 1400px) {
	.container { max-width: 1140px; }
}
@media (max-width: 767px) {
	body { background-image: url(img/background-mobile.jpg); }
	#logo { width: 400px; }
}