Thanks for posting the code. I tested it out on one of my site, and it seems
<div class="clear"><input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="button"></div>
Is not pulling the class.
Take out clear
from <div class="clear">
and leave it at " "
so it should look like <div class=" ">
and hit save your button should pop.
I’m no JS expert maybe someone else can explain why it’s not pulling the CSS of that div.