div.d3DayHourHeatmapTooltip {
    position: absolute;
    text-align: center;
	vertical-align: middle;
    width: 60px;
    height: 20px;
    pointer-events: none;
	border: 2px solid lightsteelblue;
	padding: 3px;
	font: 10px sans-serif;
	font-weight: bold;
	border-radius: 5px;
	background-color: #fff;
	font-family: Verdana, Arial, Helvetica, Tahoma, sans-serif;
}