#scaled {
    background-color: red;
}

@media screen and (device-aspect-ratio: 16/9) {
	#scaled {
		background-color: rgba(255,255,255,0.8);
	}	
}

@media (orientation:portrait) {
	#aspect-ratio-test {
		background-color: grey;
	}	
}
@media (orientation:landscape) {
	#aspect-ratio-test {
		background-color: green;
	}	
}