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there are responsive templates for Jhoomla which you will need to use. please perform a backup of everything before making any changes.<br />
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Refer below link<br />
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<a href="http://extensions.joomla.org/extension/responsivizer" rel="ugc">http://extensions.joomla.org/extension/responsivizer</a><br />
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<a href="http://www.joomlart.com/joomla/templates" rel="ugc">http://www.joomlart.com/joomla/templates</a>
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I have an existing website in Joomla 2.5.28.<br />
<br />
I'd like to tweak it to be more responsive based on viewport/device.<br />
<br />
For example, I'd like the horizontal menu to fall veritcle on smartphones.<br />
<br />
I see a &quot;mobile menu&quot; option... is there a way to utilize it?
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I have an existing website in Joomla 2.5.28.

I'd like to tweak it to be more responsive based on viewport/device.

For example, I'd like the horizontal menu to fall veritcle on smartphones.

I see a "mobile menu" option... is there a way to utilize it?

Responsive site in Joomla

Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on a model–view–controller web application framework that can be used independently of the CMS. Written in PHP, Joomla uses object-oriented programming (OOP) techniques and software design patterns, stores data in a MySQL, MS SQL  or PostgreSQL database, and includes features such as page caching, RSS feeds, printable versions of pages, news flashes, blogs, search, and support for language internationalization.