/***************************************
1. Add Spinner Styles to Your Page
	<link rel="stylesheet" href="library/spinner.css">	 
2. Add This Element to Your HTML 
	<div id="spinner"></div>
3. Update Your Function to Toggle the Spinner
	const spinner = document.getElementById('spinner');
	spinner.style.display = 'block';
	spinner.style.display = 'none';
*****************************************/
#spinner {
	position: fixed;
	top: 50%;
	left: 50%;
	width: 50px;
	height: 50px;
	margin: -25px 0 0 -25px;
	border: 6px solid #f3f3f3;
	border-top: 6px solid #3498db;
	border-radius: 50%;
	animation: spin 1s linear infinite;
	z-index: 1000;
	display: none;
}

@keyframes spin {
	0% { transform: rotate(0deg); }
	100% { transform: rotate(360deg); }
}