Use this procedure to change how your pagelets look (fonts, size, etc.) when added to your site's pages. Generally only the site design manager or the system administrator would have the necessary user rights to complete this operation.
From the System menu, select Site Design.
Click the Manage Templates button.
In the Site field of the Download Templates section, select the site whose templates you want to change.
From the Name column, select the version of the design package (usually the most recent) that you wish to edit.
Click the 
icon to edit the package. A list of design package contents is displayed in the body of the page.
Click on the pageletdesigntemplate file to open it in a basic editor.
Make the desired edits to the HTML code of the pagelet design template and click Save.
To see how the changes will look, check the Preview with content from and select a page.
Once you are satisfied with your edits, click Save a final time to return to the design package page.
Click Save as New if you want to save all your new work as an entirely new package (recommended). Click Save All if you want to overwrite the existing design package with the changes you have made (not recommended). If you choose Save as New, you can revert back to the previous package if something goes wrong.