Changes in the HTML structure

Media Query is a condition declared for browser to include or exclude a set of CSS rules or a separate stylesheet. Read more about Media Queries. There are two methods for CSS declaration with Media Queries: 1. Declare a single stylesheet and include Media Queries into CSS. Here is an example: /*---rules for mobile devices----*/ @media screen and (max-width: 480px) { #wrapper{ width: 320px; min-width: 320px; }