Jira Cloud Web Item syleClasses How do I customize styles?

We can specify custom styles for webItems.
https://developer.atlassian.com/cloud/jira/platform/modules/web-item/

Where can I define these custom styles?

For examples, where are “webitem” or “system-present-webitem” defined on?

        "styleClasses": [
          "webitem",
          "system-present-webitem"
        ],

Thanks in advance.

Hi @liumulin,
In case you are still searching for it, I just found the answer here Jira Cloud Web Item syleClasses
So sad that webItem styleClasses on cloud platform is useless

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Thanks