Remove SKU and weight from invoice

Hi,

I want to remove SKU and weight from invoices. I tried this:

add_action( 'wpo_wcpdf_custom_styles', 'wpo_wcpdf_custom_styles', 10, 2 );
function wpo_wcpdf_custom_styles ( $document_type, $document ) {	
  if ($document_type == 'invoice'){
    ?>
    .product .meta .sku .weight {
      display: none !important;
    }	
    <?php
  }
}

based on previous posts didn’t get it to work. I used code snippets to enter the code and selected “run snippet everywhere”.

Probably I am writing something wrong in this code but I am not familiar with php. Can you help me please?