[Solved] How to change font size inside option of a select box if it has number?

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Yo cant individually style elements in options. This element is rendered by the OS, not HTML. It cannot be styled via CSS. There are replacement plug-ins that look like a SELECT, but are actually composed from regular HTML elements that CAN be styled.

Use instead

https://github.com/HubSpot/select

or

https://select2.org/

solved How to change font size inside option of a select box if it has number?