diff --git a/css/structure/jquery.mobile.collapsible.css b/css/structure/jquery.mobile.collapsible.css
index 9e8a76235c4..2121f0e34c4 100644
--- a/css/structure/jquery.mobile.collapsible.css
+++ b/css/structure/jquery.mobile.collapsible.css
@@ -45,15 +45,21 @@
 	display: block;
 	margin: 0;	
 	padding: .5em 1em;
+	background-image: none;
+}
+.ui-collapsible-themed-content .ui-collapsible-content {
 	border-left-width: 0;
 	border-right-width: 0;
 	border-top-width: 0;
-	background-image: none;
+	border-bottom-width: 1px;
+	border-style: solid;
+}
+.ui-collapsible-inset.ui-collapsible-themed-content .ui-collapsible-content {
+	border-left-width: 1px;
+	border-right-width: 1px;
 }
 .ui-collapsible-inset .ui-collapsible-content {
 	margin: 0;
-	border-right-width: 1px;
-	border-left-width: 1px;
 }
 .ui-collapsible-content-collapsed {
 	display: none;