Go to https://lucid.app/ and log in to your account.

Click the "Diagrams" tab in the top navigation bar.

Select the diagram you want to add a background to.

Click the "Page Setup" button in the top right corner of the page.

Select the "Background" tab in the left sidebar.

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If you are creating a diagram in Lucidchart, you may want to add a background to make the diagram more visually appealing and easier to read. Adding a background can also help to emphasize certain elements of the diagram and make it easier to differentiate between different sections. Knowing how to add a background to your diagram in Lucidchart can help you create more professional-looking diagrams.

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