diff -u b/core/themes/bartik/css/components/captions.css b/core/themes/bartik/css/components/captions.css
--- b/core/themes/bartik/css/components/captions.css
+++ b/core/themes/bartik/css/components/captions.css
@@ -2,25 +2,24 @@
  * @file
  * Bartik styling for Captions.
  */
+
 .caption {
   margin-bottom: 1.2em;
 }
 .caption > * {
   background: #f3f3f3;
-  padding: 0.5ex;
+  padding: 0.25em;
   border: 1px solid #ccc;
 }
 .caption > figcaption {
-  border: 1px solid #ccc;
   border-top: none;
-  padding-top: 0.5ex;
-  font-size: small;
+  font-size: 0.85em;
   text-align: center;
 }
 
 /* Override Bartik's default blockquote and pre styles when captioned. */
-.caption-pre > pre,
-.caption-blockquote > blockquote {
+.caption > pre,
+.caption > blockquote {
   margin: 0;
 }
 .caption-blockquote > figcaption::before {