Slide Background
01. Slide Background
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.

Build & Design
02. Build & Design
Build any layout with layers and customize your designs limitlessly.
Step 1

To add a layer, click the green plus button in the left sidebar and select the type of layer.

Step 2

Select any layer and you can edit its content and style properties in the layer window.

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Slide Background
Build & Design
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Shadow

A component is a kind of Joomla! extension. Components are the main functional units of Joomla!; they can be seen as mini-applications. An easy analogy would be that Joomla! is the operating system and the components are desktop applications. They are usually displayed in the center of the main content area of a template (depending on the template).

Most components have two main parts: an administrator part and a site part. The site part is what is used to render pages when being called during normal site operation. The administrator part provides an interface to configure and manage different aspects of the component and is accessible through the Joomla! administrator application.

Joomla! comes with a number of core components, like the content management system, contact forms and Web Links.

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