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Change Color of an embedded button

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Site URL: https://www.sequoialongevity.com/test

Hi everyone. I'm new to coding.

I'm trying to customize an embedded form/script. The app I'm using has a Wordpress Plugin but it doesn't look like I can use it on Squarespace.

I was checking out this post on Squarespace help pages

And I can't seem to change the color on the button
This is the code I inserted in that section: 
<script src='https://www.uplaunch.com/api/v1/scripts/fetch_new_lead_form.js' data-form-url='https://marqihealth.uplaunch.com/new_lead_form_embed/11377'></script>
And what I'd like to do is change the color of the button from blue to black. 
This is what I tried in Design -> Custom CSS:
Attempt 1:
div#block-yui_3_17_2_1_1664645077280_507 a {
    background: black;
Attempt 2:
div#col-12 a {
    background: black;


I really appreciate your help!

Edited by Dafne
changed url
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You mean button "Next"?

This is not possible. The button is in iframe tag so you can't use code to change it from Squarespace.

You need to change it from the site where you got the code

Email me if you have need any help (free, of course.). Answer within 24 hours. 
Or send to forum message

How to: Setup Password & Share url Insert Custom CSS - Page Header - Upload Custom Font - Upload File - Find Block ID - Contact Customer Care

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Thanks for letting me know. I sent you an email.

Would it be possible to take the Wordpress Plugin that the company provides and put that code into the Squarespace website so that it calls the API? I have the Worpress Plugin zip file. 

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