diff --git a/agaric/css/agaric.css b/agaric/css/agaric.css
index 07a7141..7af0eaa 100644
--- a/agaric/css/agaric.css
+++ b/agaric/css/agaric.css
@@ -7188,6 +7188,10 @@ iframe {
   float: left;
   margin-right: 10px; }
 
+/* Give inline centered images the same spacing as paragraphs. */
+.align-center {
+  margin-bottom: 1em; }
+
 .label {
   color: currentColor; }