BLOCKUI not showing up correctly when WooCommerce checkout is button is clicked

Hi Tom,
thanks, that works. It does break the 2-column layout (which I don't use).
So for me it will work, thanks!

No problem!

I have the same issue but with css that you provided, as mentioned, 2 column checkout page is broken.
Is there any other solution that doesn't break 2 column checkout layout?

I have the same issue but with css that you provided, as mentioned, 2 column checkout page is broken.
Is there any other solution that doesn’t break 2 column checkout layout?

I found a solution on the web.

Add following CSS code to your Wordpress with some custom CSS plugin:

.woocommerce .blockUI.blockOverlay:before {
position:fixed!important
}

This will fix checkout spinner to the center of the screen.

Thanks for sharing the code! Glad it's working :)