diff --git src/wp-content/themes/twentyseventeen/style.css src/wp-content/themes/twentyseventeen/style.css
index f1f347fc3f..6093dad5c3 100644
--- src/wp-content/themes/twentyseventeen/style.css
+++ src/wp-content/themes/twentyseventeen/style.css
@@ -4030,6 +4030,13 @@ p > object:only-child {
 		margin-bottom: 2.5em;
 	}
 
+	/* Comments block CSS */
+	.wp-block-comments h2#comments {
+		float: none;
+		width: 100%;
+		padding: 1em 0 0 0;
+	}
+
 	ol.children .children {
 		padding-left: 2em;
 	}