Adding inline CSS code to apps
To add simple formatting to all the visuals and dashboards in the app, in the App Designer interface, navigate to the Custom Style menu of an app, and enter a CSS code snippet in the text box under the Inline CSS option.
You can select the Autocomplete option, too.
To apply this operation at the level of a specific visual or dashboard, see Adding inline CSS code to visuals and Adding inline CSS code to dashboards.