diff --git a/lib/editor/tiny/editor_styles.css b/lib/editor/tiny/editor_styles.css
index 84bc14158b7..09672c3ac7c 100644
--- a/lib/editor/tiny/editor_styles.css
+++ b/lib/editor/tiny/editor_styles.css
@@ -10,4 +10,18 @@ body.mce-content-body a[data-mce-selected="inline-boundary"] {
 body.mce-content-body a {
     color: #0f6cbf;
 }
-/** */
\ No newline at end of file
+
+/** blockquote */
+.mce-content-body:not([dir=rtl]) blockquote {
+    margin: 0 0.5rem 1rem;
+    padding-left: 1rem;
+    color: #495057;
+    border-left: 5px solid #8f959e;
+}
+.mce-content-body[dir=rtl] blockquote {
+    margin: 0 0.5rem 1rem;
+    padding-right: 1rem;
+    color: #495057;
+    border-right: 5px solid #8f959e;
+}
+/** */