You don't need to use jQuery. In the form editor go to the "Style & preview" tab and toggle on "Set as raw HTML form". This will remove any HubSpot styling and allow you to style them purely with CSS in your stylesheet. Here's an example stylesheet for styling HubSpot forms so you can see some of the classes used - https://github.com/HubSpot/cms-theme-boilerplate/blob/main/src/css/elements/_forms.css
Also, HubSpot uses just regular ol form elements so once set to raw HTML it'll take on any styling you already have set for form elements (as long as you're styling the elements themselves and not using custom classes instead).
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You don't need to use jQuery. In the form editor go to the "Style & preview" tab and toggle on "Set as raw HTML form". This will remove any HubSpot styling and allow you to style them purely with CSS in your stylesheet. Here's an example stylesheet for styling HubSpot forms so you can see some of the classes used - https://github.com/HubSpot/cms-theme-boilerplate/blob/main/src/css/elements/_forms.css
Also, HubSpot uses just regular ol form elements so once set to raw HTML it'll take on any styling you already have set for form elements (as long as you're styling the elements themselves and not using custom classes instead).
If this answer solved your question, please mark it as the solution.