diff --git a/includes/EditPage.php b/includes/EditPage.php
index 9d897857d52..d047f6e2f88 100644
--- a/includes/EditPage.php
+++ b/includes/EditPage.php
@@ -4045,11 +4045,11 @@ ERROR;
 
 		if ( $this->isConflict ) {
 			$conflict = Html::rawElement(
-				'h2', [ 'id' => 'mw-previewconflict' ],
+				'div', [ 'id' => 'mw-previewconflict', 'class' => 'warningbox' ],
 				$this->context->msg( 'previewconflict' )->escaped()
 			);
 		} else {
-			$conflict = '<hr />';
+			$conflict = '';
 		}
 
 		$previewhead = Html::rawElement(
@@ -4058,7 +4058,9 @@ ERROR;
 				'h2', [ 'id' => 'mw-previewheader' ],
 				$this->context->msg( 'preview' )->escaped()
 			) .
-			$out->parseAsInterface( $note ) . $conflict
+			Html::rawElement( 'div', [ 'class' => 'warningbox' ],
+				$out->parseAsInterface( $note )
+			) . $conflict
 		);
 
 		$pageViewLang = $this->mTitle->getPageViewLanguage();
diff --git a/includes/actions/McrUndoAction.php b/includes/actions/McrUndoAction.php
index 41cd24e7012..68c0ea12432 100644
--- a/includes/actions/McrUndoAction.php
+++ b/includes/actions/McrUndoAction.php
@@ -289,8 +289,9 @@ class McrUndoAction extends FormAction {
 				'h2', [ 'id' => 'mw-previewheader' ],
 				$this->context->msg( 'preview' )->text()
 			) .
-			$out->parseAsInterface( $note ) .
-			"<hr />"
+			Html::rawElement( 'div', [ 'class' => 'warningbox' ],
+				$out->parseAsInterface( $note )
+			)
 		);
 
 		$pageViewLang = $this->getTitle()->getPageViewLanguage();
diff --git a/resources/src/mediawiki.legacy/shared.css b/resources/src/mediawiki.legacy/shared.css
index 2c88bdc7cd4..75dae924043 100644
--- a/resources/src/mediawiki.legacy/shared.css
+++ b/resources/src/mediawiki.legacy/shared.css
@@ -436,15 +436,9 @@ a.new {
 
 /* Note on preview page */
 .previewnote {
-	color: #d33;
 	margin-bottom: 1em;
 }
 
-.previewnote p {
-	text-indent: 3em;
-	margin: 0.8em 0;
-}
-
 .visualClear {
 	clear: both;
 }