Mother_board
01. Hardware selection
Every slide includes a background, which can be a picture or solid color.
Step 1

To change the background click on the label bar and in the layer window select the style tab.

Step 2

Choose a source from the background top tab then upload an image or pick a background color.

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Mother_board
CPU
Fibre cable
Fibre cable
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Shadow

A template is a type of Joomla! extension that changes the way your site looks.

There are two types of templates used by the Joomla! CMS: Front-end Templates and Back-end Templates. The Front-end Template controls the way your website is presented to the user viewing the website's content. The Back-end Template controls the way your website's administrative tasks are presented for controlling management functions by a Joomla! Administrator. These would include common tasks such as: user, menu, article, category, module, component, plugin and template management.

Reference: http://docs.joomla.org/Glossary