Legend Background Chart
Line Chart > Legend Background

- Click on hamburger icon.

- Click on dashboard tab and open Line Chart in edit mode.

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The Edit menu box appears as you click on Line chart icon. And a widget gets added in content place automatically in dashboard.
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In Formatting Property click on Legend Property.
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Enter Following details in Legend Background:
- Background Color: #ff1717
- Fill above details in edit box, As Shown in figure:

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Click on Publish button.
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Now, match your Line chart with the below example, it should look like the figure below:
