Index: wp-content/themes/twentyseventeen/assets/css/editor-blocks.css
===================================================================
--- wp-content/themes/twentyseventeen/assets/css/editor-blocks.css	(revision 55900)
+++ wp-content/themes/twentyseventeen/assets/css/editor-blocks.css	(working copy)
@@ -818,3 +818,11 @@
 	margin-left: 0;
 	margin-right: 0;
 }
+
+/* Latest Comments */
+
+.wp-block-latest-comments__comment-author,
+.wp-block-latest-comments__comment-link {
+	font-weight: 700;
+	text-decoration: none;
+}
\ No newline at end of file