CSS Used in this blog post: https://developerscorner.storymaps.arcgis.com/add-context-to-story-map-journal-with-an-index-map-ccc3c8ca12b5#.e8dcfwisq

blogs_2016_mapJournalIndexMap.css

#index-map{
	position: relative;
	width: 100%;
	height: 25%;
	max-height: 400px;
	min-height: 200px;
	margin-bottom: 2px;
}

.sectionPanel .appTitle.anchored{
	margin-top: 5px;
}

#index-map-info{
	background-color: #006900; /* Point hover tooltip background color */
	color: #fff8e8; /* Point hover tooltip text color */
	display: none;
	position: fixed;
	font-weight: bold;
	padding: 5px;
	margin: -10px 0 0 5px;
	border-radius: 5px;
	z-index: 100;
}

#index-map-helper{
	display: none;
}

#index-map:hover #index-map-helper.active{
	background-color: #fff8e8; /* Point hover tooltip background color */
	color: #006900; /* Point hover tooltip text color */
	display: block;
	position: absolute;
	left: 50%;
	margin-left: -116px;
	bottom: 20px;
	padding: 5px 10px;
	border-radius: 30px;
	cursor: pointer;
	z-index: 30;
}