buzztone on "[Plugin: Contact Form 7] How to center Submit button"

Hi everybody,
I tried with everything but I still can't center the submit button.

Can someone help me?

https://wordpress.org/plugins/contact-form-7/

See Styling Contact Form 7 Forms for a general explanation of styling CF7 forms using CSS.
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​See also the following CF7 Skins Documentation which might help you:
How to Customise Your Selected CF7 Skins Style - covers how change form style, colors & font used.

If you find you need more detailed advice, after reading and working through the above links, please include a link to your Contact Form 7 form, so others here can examine your form in detail using Firebug or Chrome Dev Tools to understand the CSS used for your CF7 form elements and provide you with a possible solution.