Mass-media queries are simple filters that can be applied to CSS styles. They make it easy to change styles based on the types of device rendering the content, or the features of that device, for example width, height, orientation, ability to hover, and whether the device is being used http://themeforest48260.idblogz.com/7717609/esamina-la-relazione-sulla-come-si-crea-un-sito-web-vetrina