You can center the submit button on your web form by using CSS.  First, click on Toolkit > Web Form > Edit.  

Click the Design tab > Advanced Theming.


This is where you can edit and style your form through the CSS Editor.  To center the submit button, add the code below after line 34 where you it says submit button. 

.cs-v2-form-submit {

position: absolute;

left: calc(40% - 20px);

}

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