This is an example of React Chart crosshairs. In order to enable crosshairs you have to set the enableCrosshairs setting to true. You can style the crosshairs by using the crosshairsDashStyle, crosshairsLineWidth and crosshairsColor settings.
U.S. Stock Market Index Performance
NASDAQ Composite compared to S&P 500
1-Jan-2014
1-Feb-2014
1-Mar-2014
1-Apr-2014
1-May-2014
1-Jun-2014
1-Jul-2014
1-Aug-2014
1-Sep-2014
1-Oct-2014
1-Nov-2014
1-Dec-2014
1-Jan-2015
S&P 500
NASDAQ
Daily Closing Price
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3500
4000
4500
5000