title: Highcharts Plot background
body: <p>Is it possible to create a Highcharts plot background like the picture below? It's important it will adjust when the plot is zoomed in/out.</p>
  <p>E.g. Using radialGradient, but without the &quot;gradient&quot; between the colors.</p>
  <p><a href="https://i.stack.imgur.com/9l8tA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9l8tA.png" alt="Highcharts background" /></a></p>