You can make your expandable sections stand out by updating your style sheet with a new class. Style sheets let you define the style attributes for the section. For example, you can make the section have a colored border, or a repeating graphic for the background. You can also add style attributes to fine-tune the spacing, margins, and overall positioning of the section.
This is the style class that we have defined for the sidebars in the HTML Help documentation:
<STYLE>
DIV.sidebartext {
	position: relative;
	left: -22px;
	height: 72px;
	width: 300px;
	margin-top: .6em;
	margin-right: 3em;
	margin-left: 0;
	margin-bottom: .6em;
	padding-top: .75em;
	padding-right: 6px;
	padding-left: .75em;
	padding-bottom: .75em;
	cursor: hand;
	border-left: 4pt solid #339900;
	background-color: #F0F0F0; }
</STYLE>
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