diff --git a/resources/screen-common.less b/resources/screen-common.less
index 288a6be..b3ce8f5 100644
--- a/resources/screen-common.less
+++ b/resources/screen-common.less
@@ -510,6 +510,9 @@ ul {
 .thumbinner {
 	.box;
 	padding: 0.75em;
+	/* Properly center framed thumbnail images (T219717) */
+	margin-left: auto;
+	margin-right: auto;
 }
 
 .thumbcaption {