Override the default form styling with custom CSS when you want pixel-perfect control over how the form looks on your theme.
How to add custom CSS
In the form editor, open the Customize card.
Click Edit CSS.
A side-by-side editor opens — write your CSS on the left, click any class on the right to insert it.
Save.
Common overrides
Common selectors you might target:
.storeforms-form__submit— the submit button.storeforms-form__input— text inputs.storeforms-form__label— field labels.storeforms-form__field— the wrapper around each field
Tip
Custom CSS is scoped to the form block — it won't leak out and affect other parts of your theme.