Jason changes the WooCommerce Checkout Custom Ajax Spinner

snippet.php

add_action('wp_head', 'custom_ajax_spinner', 1000 );
function custom_ajax_spinner() {
    ?>
    <style>
    .woocommerce .blockUI.blockOverlay:before,
    .woocommerce .loader:before {
        height: 3em;
        width: 3em;
        position: absolute;
        top: 50%;
        left: 50%;
        margin-left: -.5em;
        margin-top: -.5em;
        display: block;
        content: "";
        -webkit-animation: none;
        -moz-animation: none;
        animation: none;
        background-image:url('<?php echo get_stylesheet_directory_uri() . "/img/my_spinner.gif"; ?>') !important;
        background-position: center center;
        background-size: cover;
        line-height: 1;
        text-align: center;
        font-size: 2em;
    }
    </style>
    <?php
}