Creating a Full-Screen HTML/CSS Loader for AJAX Requests simple

Pate the below code in any File and save it as html file.

<!--------- CSS ---------->
<style>
	#loader {
    position: fixed;
    z-index: 9999;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    display: none;
}

.spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top-color: #333;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

</style>
<!--------- HTML ---------->
<div id="loader">
	<div class="spinner"></div>
</div>
<button id="submit-btn">Submit</button>
<!--------- JS ---------->
<script type="text/javascript">
	const loader = document.getElementById('loader');
	const submitBtn = document.getElementById('submit-btn');

	submitBtn.addEventListener('click', function() {
	    loader.style.display = 'flex';
	    // Perform AJAX request here
	    setTimeout(function() {
	        loader.style.display = 'none';
	    }, 2000); // Remove after 2 seconds to simulate AJAX response
	});

</script>