Your question does not make it clear what are you tryiing to do, but the following documentation articles cover the various possible scenarios that you may be after.
- override the widget's styling
- use custom HTML markup and CSS styling inside the Grid cells
- use custom HTML markup and CSS styling for the Grid cells and rows, and inside them
- create custom CSS themes
When working with custom CSS code, you need to be able to use the browser's DOM inspector, so that you can find the HTML elements and their CSS classes. You also need to be able to construct CSS selectors to target the desired elements, and be familiar with the concept of CSS specificity.
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