The landing page is just complicated web content displayed through a web content display portlet. What you need to know about the landing page is that in order to update the content you may need to go to three different places:
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Edit the web content through the web content display
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While on the landing page click on the icon with the paper and pencil -- "Edit Web Content"
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Make sure and click on the "Source" button within the WYSIWYG editor.
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Edit the CSS from the portlet specific to update the way the page displays (e.g., positioning of text on the screen)
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While on the landing page in the upper right portion of the Web Content Display portlet click on "Options" (wrench) -> Look and Feel -> Advanced Styling.
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Edit the javascript to change the behavior of the page
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While on the landing page click "Manage Page" in the Doc bar -> JavaScript
Please note that the web content itself is version controlled through the CMS, but the CSS and javascript are not. So if you make updates to these sections make sure and save a copy of the original so you have something to revert back to if you make an error. It is best to test things out in or development instance first.