Change Direct Stripe spinner animation

ds-spinner.php

<?php
/* Custom Direct Stripe spinner animation */
add_filter( 'direct_stripe_processing_transaction_spinner', function( $html, $begin, $end, $text, $dots, $instance){
  
	return '<div id="loadingDS-' . $instance . '" class="loadingDS-container loader" style="display:none;"></div>';
  
}, 10, 6);

style.css

/* insert this styles in theme stylesheet or via admij at Appearance -> Customize -> Additional CSS */
.loader {
  border: 16px solid #f3f3f3; /* Light grey */
  border-top: 16px solid #3498db; /* Blue */
  border-radius: 50%;
  width: 120px;
  height: 120px;
  animation: spin 2s linear infinite;
  margin-top: -5em !important;
}

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