Sometimes you need to add some piece of codes before or after your WooCommerce checkout page. You may want to add some CSS style-sheets or HTML codes. If your WordPress does not support this feature, follow the below steps.
This action will be done by adding a PHP code into functions.php of your main theme or child theme. Check your WordPress theme folder and check if your theme as a child them since our preference is to edit the functions.php of your child theme.
After opening the functions.php, navigate the end of the file and paste the below code right before "?>" if you have it.