Snippet / Theme Options > Custom CSS or Contact Form module CSS class

Center the Divi Contact Form Submit Button

A small CSS fix that centers Divi's contact form submit button when the default left alignment feels unfinished.

Add dfy-contact-centered-submit to the Contact Form module.

.dfy-contact-centered-submit .et_contact_bottom_container {
  float: none;
  display: flex;
  justify-content: center;
  width: 100%;
  margin-top: 18px;
  text-align: center;
}

.dfy-contact-centered-submit .et_pb_contact_submit {
  margin: 0;
}

Notes

If the form uses CAPTCHA or extra inline controls, test at tablet and phone widths.
This is a good companion to custom form field styling.

Sources