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 Cascading Style Sheet or CSS is used to control the presentation of an XHTML page. For example, a CSS file will often control the font, margins, color, background graphics, and other aspects of a web page's appearance. CSS allows you to separate the content of an XHTML page from it's appearance. In Joomla!, CSS files (for example, template.css) are normally part of the template.

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