diff --git a/core/themes/seven/dialog.theme.css b/core/themes/seven/dialog.theme.css
index 26aab89..368e420 100644
--- a/core/themes/seven/dialog.theme.css
+++ b/core/themes/seven/dialog.theme.css
@@ -17,7 +17,7 @@
   padding: 20px;
 }
 .ui-dialog .ui-dialog-title {
-  font-size: 22px;
+  font-size: 1.231em;
   font-weight: 600;
   margin: 0;
   color: #ffffff;
@@ -32,13 +32,13 @@
   height: 16px;
   width: 16px;
 }
-.ui-dialog .ui-icon-closethick {
+.ui-dialog .ui-icon.ui-icon-closethick {
   background: url('../../misc/icons/ffffff/ex.svg') 0 0 no-repeat;
 }
-.ui-dialog .ui-dialog-content {
+.ui-dialog .ui-widget-content.ui-dialog-content {
   background: #ffffff;
 }
-.ui-dialog .ui-dialog-buttonpane {
+.ui-dialog .ui-widget-content.ui-dialog-buttonpane {
   background: #f5f5f2;
   border-top: 1px solid #bfbfbf;
   margin: 0;
diff --git a/core/themes/seven/jquery.ui.theme.css b/core/themes/seven/jquery.ui.theme.css
index 0ff1542..559f8a8 100644
--- a/core/themes/seven/jquery.ui.theme.css
+++ b/core/themes/seven/jquery.ui.theme.css
@@ -8,10 +8,10 @@
  * Component containers
  */
 .ui-widget {
-  background: #fff;
+  background: none;
 }
 .ui-widget-content {
-  border: solid 1px #ccc;
+  border: none;
 }
 
 /**