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Then you are probably calling chart.render() even before the width and height of Chart’s Container (DIV) is set/initialized by the browser. Basically you need to call chart.render() after the DIV is initialized by browser. In case you are not able to find a way to do that, you can work around such problems by calling chart.render() after a bit of delay by using setTimeout – something like 500ms or 1000ms should work.
In case you are still not able to fix the issue, please create a jsfiddle so that we can have a look.