Responsive Web Design ( RWD ) is an approach to web design in which a site is crafted to provide an optimal viewing experience—easy reading and navigation with a minimum of resizing, panning, and scrolling—across a wide range of devices (from desktop computer monitors to mobile phones). Elements of Responsive Web Design A site designed with RWD uses CSS3 media queries an extension of the @media rule, to adapt the layout to the viewing environment—along with fluid proportion-based gridsand flexible images: Media queries allow the page to use different CSS style rules based on characteristics of the device the site is being displayed on, most commonly the width of the browser . The fluid grid concept calls for page element sizing to be in relative units like percentages or EMs , rather than absolute units like points (which are typically for print media).Note that pixels are relative units. Flexible images are also sized in relative units (other than pixels), such
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