.chartWithOverlay_01 {
           position: relative;
           width: 800px;
    }
	.chartWithOverlay_02 {
           position: relative;
           width: 800px;
    }
    .overlay {
           width: 400px;
           height: 100px;
           position: absolute;
           top: 100px;   /* chartArea top  */
           left: 260px; /* chartArea left */
    }