[Plugin: Contact Form 7 Datepicker] Change position Pop ups

Hello,

I am trying to find out how I can change the position of the calander pop up.
I found this:

<div class=”JsDatePickBox” style=”z-index: 3; position: absolute; top: 18px; left: 0px;”
I would like that to become: left: -20px;

But where is the file to edit?
Hope you can help me out with this!

Sito

https://www.ads-software.com/extend/plugins/contact-form-7-datepicker/