use hopefully better supported 'external site link' indicator...

theme/static/css/main.css

@@ -302,7 +302,8 @@ a:hover {
 }
 a.external::after {
 	/* content: '↪'; */
-	content: '🡕';
+	/* content: '🡕'; */
+	content: '⤤';
 	/*background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20.092'%3E%3Cpath d='m12 0 2.561 2.537-6.975 6.976 2.828 2.828 6.988-6.988L20 7.927 19.998 0H12z'/%3E%3Cpath d='M9 4.092v-2H0v18h18v-9h-2v7H2v-14h7z'/%3E%3C/svg%3E");
 	background-repeat: no-repeat no-repeat;
 	background-position: center center;