Nowadays we can easily access internet in different devices such as mobile, tablet etc. So its necessary to make a website compatible with popular devices like iPhone, iPad etc. In Drupal, we have a simple method to make a website adapt to different devices. In this method we can convert a normal theme to responsive theme easily. To get this we have to modify the .info file and add the media query stylesheets in .info file. We will also have to add the responsive style rules to the separate media query stylesheets