How can i remove the Unit & Total Price in Delivery Note

I have copy & pasted the following via Code Snippet, but it doesn’t work at all. Can assist on matter?

function example_price_free_delivery_note() {
?>
<style>
.delivery-note .head-item-price,
.delivery-note .head-price,
.delivery-note .product-item-price,
.delivery-note .product-price,
.delivery-note .order-items tfoot {
display: none;
}
.delivery-note .head-name,
.delivery-note .product-name {
width: 50%;
}
.delivery-note .head-quantity,
.delivery-note .product-quantity {
width: 50%;
}
.delivery-note .order-items tbody tr:last-child {
border-bottom: 0.24em solid black;
}
</style>
<?php
}
add_action( ‘wcdn_head’, ‘example_price_free_delivery_note’, 20 );