For the form we are using The Plugin Contact form 7.

For the styling of the submit button, a button class should be added, primary-button, secondary-button, neutral-button -> usually primary-button though. Also do not forget the typography class, single-line-body-base or sinlge-line-body-base-strong.

[submit class:single-line-body-base class:primary-button "Υποβολή"]

For the styling of labels, again we need to add the respective typography classes.

<label class="body-base"> Το όνομά σας
[text* your-name autocomplete:name] </label>

 Styles for the input fields are defined in the module's Advanced (Για προχωρημένους) -> CSS