You can right click on any element in the browser and select inspect element. By doing that, you will be able to see the CSS class and codes in the bottom and the class, styles and from where they are coming from on the right side.
For more details, you can read this doc https://developer.chrome.com/devtools/docs/dom-and-styles
When you get the class, you just need to write that on your themes CSS (or on a child theme) file.
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