diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -123,7 +123,7 @@
     'rsrc/css/layout/phabricator-source-code-view.css' => '2ceee894',
     'rsrc/css/phui/calendar/phui-calendar-day.css' => 'c0cf782a',
     'rsrc/css/phui/calendar/phui-calendar-list.css' => 'c1c7f338',
-    'rsrc/css/phui/calendar/phui-calendar-month.css' => '94b1750a',
+    'rsrc/css/phui/calendar/phui-calendar-month.css' => '0a10f63e',
     'rsrc/css/phui/calendar/phui-calendar.css' => 'ccabe893',
     'rsrc/css/phui/phui-action-header-view.css' => '89c497e7',
     'rsrc/css/phui/phui-action-list.css' => '4f4d09f2',
@@ -767,7 +767,7 @@
     'phui-calendar-css' => 'ccabe893',
     'phui-calendar-day-css' => 'c0cf782a',
     'phui-calendar-list-css' => 'c1c7f338',
-    'phui-calendar-month-css' => '94b1750a',
+    'phui-calendar-month-css' => '0a10f63e',
     'phui-crumbs-view-css' => '594d719e',
     'phui-document-view-css' => '94d5dcd8',
     'phui-feed-story-css' => 'c9f3a0b5',
diff --git a/webroot/rsrc/css/phui/calendar/phui-calendar-month.css b/webroot/rsrc/css/phui/calendar/phui-calendar-month.css
--- a/webroot/rsrc/css/phui/calendar/phui-calendar-month.css
+++ b/webroot/rsrc/css/phui/calendar/phui-calendar-month.css
@@ -32,18 +32,21 @@
   display: inline;
 }
 
+table {
+  height: 100%;
+}
+
 table.phui-calendar-view td {
   border: solid #dfdfdf;
   border-width: 1px 1px 0 1px;
   width: 14.2857%; /* This is one seventh, approximately. */
-}
-
-.phui-calendar-month-cell-div {
-  position: relative;
+  display: table-cell;
 }
 
 .phui-calendar-month-event-list .phui-calendar-month-cell-div {
   min-height: 125px;
+  height: 100%;
+  display: block;
 }
 
 .device .phui-calendar-month-event-list .phui-calendar-month-cell-div {