Help needed to center align Form (embed Active Campaign)

Site URL: https://redesign-90-day-biz.squarespace.com/about

https://redesign-90-day-biz.squarespace.com/about

pw: WhorunTheWorld?2

If you scroll down to the "How to launch your dream business in Uncertain Times..." - you'll see a form embedded there. (it's pulling from Active Campaign.) Attached is a screenshot of how the designer would like this to look. I am having all sorts of trouble getting this to look center-aligned, especially in mobile. Even harder is to get the button to appear on a second line - but as long as it's center-aligned, that's what is most important.

Since it's embedded (via a code block), I have little control over the html - more control over the CSS. Can anyone help me out?

Thank you in advance!
Rachel

I made some changes,

<style>
	._inline-form {
        width: 100% !important;
        text-align: center !important;
        margin: 0 !important;
        margin-top: -17px !important;
      }
      ._form-content ._form_element,
      ._form-content ._button-wrapper {
        display: inline-block !important;
        float: none !important;
      }
      ._form-content ._form_element {
        width: auto !important;
      }
      ._form-content ._button-wrapper {
        margin: 0 auto !important;
        display: block !important;
        float: none !important;
        margin: 0 !important;
      }
</style>

You can place it under the html code block

@bangank36 -  I can't thank you enough for your help!! This worked beautifully.