diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -9,7 +9,7 @@
   'names' => array(
     'conpherence.pkg.css' => 'e68cf1fa',
     'conpherence.pkg.js' => '15191c65',
-    'core.pkg.css' => '49b87886',
+    'core.pkg.css' => '29452b31',
     'core.pkg.js' => '1ea38af8',
     'differential.pkg.css' => '113e692c',
     'differential.pkg.js' => 'f6d809c0',
@@ -112,7 +112,7 @@
     'rsrc/css/application/tokens/tokens.css' => '3d0f239e',
     'rsrc/css/application/uiexample/example.css' => '528b19de',
     'rsrc/css/core/core.css' => '62fa3ace',
-    'rsrc/css/core/remarkup.css' => '1828e2ad',
+    'rsrc/css/core/remarkup.css' => '924fc97d',
     'rsrc/css/core/syntax.css' => 'cae95e89',
     'rsrc/css/core/z-index.css' => '9d8f7c4b',
     'rsrc/css/diviner/diviner-shared.css' => '896f1d43',
@@ -780,7 +780,7 @@
     'phabricator-object-selector-css' => '85ee8ce6',
     'phabricator-phtize' => 'd254d646',
     'phabricator-prefab' => '77b0ae28',
-    'phabricator-remarkup-css' => '1828e2ad',
+    'phabricator-remarkup-css' => '924fc97d',
     'phabricator-search-results-css' => '505dd8cf',
     'phabricator-shaped-request' => '7cbe244b',
     'phabricator-slowvote-css' => 'a94b7230',
diff --git a/webroot/rsrc/css/core/remarkup.css b/webroot/rsrc/css/core/remarkup.css
--- a/webroot/rsrc/css/core/remarkup.css
+++ b/webroot/rsrc/css/core/remarkup.css
@@ -34,6 +34,7 @@
   display: inline-block;
   border-top-left-radius: 3px;
   border-top-right-radius: 3px;
+  overflow: hidden;
 }
 
 .phabricator-remarkup .code-block-counterexample .remarkup-code-header {