[QUESTIONS] How to set different styles on one element for each device. (responsive)

@arthuralmeidap can you tell guide me how to set style different style for each device. I use the mobile-first strategy.

For example to set a different background on mobile and desktop devices.

mediaCondition: 'min-width',

var deviceManagerConfig = { devices: [ { name: 'Desktop', width: '', widthMedia:'768px' },

{
					name: 'Tablet',
					width: '768px',
					widthMedia:'320px'
				},
				{
					name: 'Mobile',
					width: '320px',
					widthMedia:'0px'
				}
			]
		};