How to change the source of a ready-made E-GOI/WP integration CSS code?

Question

I am new in the area of Web programming and would like a lot of help from you about a problem that has arisen here! (I have tried support).

I created a site in Wordpress where you have a contact form linked to E-goi, so far so good, however, to see the font size from the button ("I Want to Schedule Now"), it was very small!

The page is this one:

http://solangenutricoach.com.br/enfoco
http://solangenutricoach.com.br/13sabotadores/

Code of the E-goi form:

var _egoiLoaderMulti = _egoiLoaderMulti || [];
var _egoiLoaderValues = [];

_egoiLoaderValues.push(["_setForm", "9ebeDAje5q8N0H2the93d-c027"]);
_egoiLoaderValues.push(["_setList", "9"]);
_egoiLoaderValues.push(["_setResource", "0ce6ae0ea5282dae0d5957b75d7a02dd"]);
_egoiLoaderValues.push(["_setUrl", "http://mkt.bitcoinalx.com/"]);
_egoiLoaderValues.push(["_setType", "button"]);
_egoiLoaderValues.push(["_setColor", "#00ff00"]);
_egoiLoaderValues.push(["_setFontColor", "#ffffff"]);
_egoiLoaderValues.push(["_setText", "QUERO AGENDAR AGORA"]);
_egoiLoaderValues.push(["_setWidth", "320"]);
_egoiLoaderValues.push(["_setHeight", "348"]);
_egoiLoaderValues.push(["_setSubscriberCount", "false"]);
_egoiLoaderValues.push(["_setSubscriberLabel", "contatos"]);

_egoiLoaderMulti.push(_egoiLoaderValues);

(function() {
  var egoi = document.createElement("script"); egoi.type = "text/javascript"; egoi.async = true;
  egoi.src = "http://mkt.bitcoinalx.com/include/javascript/egoi.js";
  var e = document.getElementById("script_9ebeDAje5q8N0H2the93d-c027"); e.parentNode.insertBefore(egoi, e);
})();

<div id="a9ebeDAje5q8N0H2the93d-c027"></div>

<!--Paste this code where you want the button to appear-->
<div class="egoi_button" id="b9ebeDAje5q8N0H2the93d-c027"></div>

The question is as follows: How to create an element to change only the font size of the "I Want To Schedule Now"?