trwnh.com/unified.test.hugo/layouts/partials/styles/external-links.html

<style>
a[href]:not(.footnote-ref):after {
	content: '';
	display: inline-grid;
	inline-size: 1rem;
	block-size: 0.875rem;
	font-size: 1rem;
	background-color: currentColor;
	mask: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxZW0iIGhlaWdodD0iMWVtIiB2aWV3Qm94PSIwIDAgMjQgMjQiPjxnIGZpbGw9IndoaXRlIj48cGF0aCBkPSJNMTUuNjQgNy4wMjVoLTMuNjIydi0yaDd2N2gtMnYtMy41NWwtNC45MTQgNC45MTRsLTEuNDE0LTEuNDE0eiIvPjxwYXRoIGQ9Ik0xMC45ODIgNi45NzVoLTZ2MTJoMTJ2LTZoLTJ2NGgtOHYtOGg0eiIvPjwvZz48L3N2Zz4=');
	mask-repeat: no-repeat;
}

a[href^="{{.Site.BaseURL}}"]:not(.footnote-ref):after,
a[href^="#"]:not(.footnote-ref):after,
a[href^="/"]:not(.footnote-ref):after
{
	background-image: none !important;
	display: none;
}
</style>