magento2 – how to change “add to wish list” button with an image


How do I change this ‘add to wish list’ button into an icon? I have a png file for this button
enter image description here

I did some research online. Some people say by CSS, but not work for me

<style>
.product-social-links .action.towishlist:before {
    background-image: url('/wysiwyg/icons-like-customize-share-sized.png');
}
</style>

enter image description here