Embedding code without an iframe.

I have a third-party code that doesn’t work when it is embedded in an iframe, and therefore needs to be taken out from the Wix Embeds iframe. (This is due to a new security protocol that causes the browsers to not pass info from the iframes.) Can anyone guide me on how to do this?
Thank you

<head>

<title>Client Page to Client Portal Login Sample: SimplicityCollect</title>

<script type="text/javascript">                 
function checkForMessage() {                          
var message = getUrlParam('error_msg');                          
if (message != "")                                   
alert(unescape(message));                 }                  
function getUrlParam(name) {                          
name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");                          
var regexS = "[\\?&]" + name + "=([^&#]*)";                          
var regex = new RegExp(regexS);                          
var results = regex.exec(window.location.href);                          
if (results == null)                                   
return "";                          
else                                   
return results[1];                 }         
</script>

</head>

<body onload="checkForMessage()">
<form action="https://app.simplicitycollect.com/Login.aspx" method="post">
<input name="client_portal_login" value="true" type="hidden" />
<input name="company_pin" value="2109" type="hidden" />
<input name="login_url" value="https://www.thefaircapital.com/client-login" type="hidden" />
<input name="logout_url" value="https://www.thefaircapital.com/client-login" type="hidden" />
<center>Username: <input name="username" type="text" /><br />
Password: <input name="password" type="password" /><br />
<input value="Login" type="submit" />          </form>
</center>
</body>

Hi,
Currently, all possible ways of embedding 3rd party code are described here .