Iframe Coding Help Please

Hello Itai. Below is the code I entered into iframe. for some reason when I test out and enter information and hit the ‘send’ button it doesn’t seem to load anything or transfer the data. Not sure what I am missing. Also, is there a way to make the ‘send’ link actually look like a button and make the name and email fields look more appealing? Thank you for taking a look. Code: <form accept-charset=“UTF-8"action=” https://spark.re/urban-315/rainier-view-homes/register " id=“spark-registration-form” method=“post”>

First Name
Last Name
Email
Submit <input type="hidden" name="redirect_error" id="redirect_error" value=""