You can set a background color and/or image on lists or items within them.
How to add a background to a list using a style
Open the topic style sheet that you want to modify.
Make sure the appropriate medium is selected. If you are not using style sheet mediums for your different outputs or if you want all mediums to have the same settings, just leave the medium set to "default" and continue.
(which means that the Advanced view is currently shown in the editor). If the button displays
instead, then click it.
and select Show List Styles.Select the appropriate list style. For example, you can select the parent li tag, or you can select a class that you may have created for that tag (e.g., li.Bold, li.Italic). For more information about the <li> tag and the other tags for lists, see List Style Tags.
on the upper-right side of the editor, select Show: Property Groups.
next to Background to expand the group.The property name is shown in the left column. The right column is used for selecting and entering values for the property.Set a color for the background:
Add an image to the background:
to save your work.
After editing a style, you can apply it to content in a topic. See Applying Styles to Topic Content.