To make a website mobile, use specific code to size the width and height of the site for mobile devices. However, using code does not size the website for multiple types of devices. It is best to use a content management system to optimize websites for mobile devices from the beginning of the design process. As of 2015, the most popular CMS programs are Wordpress, Joomla and Drupal, which allow users to create what are called "responsive websites."
Most content management programs that individuals use to build websites are both affordable and user friendly, and they offer the responsive theme in many layouts and designs. Designing a responsive website from the beginning provides for seamless viewing on both desktops and mobile devices.
The designer or content management system of a responsive theme for a mobile website creates it on the backend by using CSS code that responds to the size of the mobile screen. This layout then adjusts to the best viewing option for the end user.
The alternative to creating a mobile website is to use a program that builds the mobile version of the desktop version of the website. The disadvantage of this option is that there are then two websites that the user needs to update at all times.
Responsive designs for websites also provide for better rankings on Google. This occurs because Google measures sites on how friendly they are for mobile devices.