Your form shouldn't be taking that long to send unless the user is uploading files?
You can easily add in an animating spinner or anything else though by just creating a hidden div with the animation and then use some javascript/jquery to display when clicking the submit button. For example... (may not work)
CSS:
#submitting{
background: rgba(0,0,0,0.8);
text-align: center;
color: #fff;
font-size: 40px;
line-height: 40px;
display: flex;
align-items: center;
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100vh;
z-index: 500;
}
HTML
<aside id="submitting">
<small>Submitting...Put in anything here.</small>
</aside>
JS
$('#submit').click(function(event) {
$('#submitting').fadeIn();
});
