Editor: Fixed horizontal overflow css issue.

editor/css/main.css

@@ -67,13 +67,13 @@ textarea, input { outline: none; } /* osx */
 	position: relative;
 	display: block;
 	width: 100%;
+	min-width: 260px;
 }
 
 .TabbedPanel .Tabs {
 	position: relative;
 	display: block;
 	width: 100%;
-	min-width: 300px;
 }
 
 	.TabbedPanel .Tabs .Tab {
@@ -85,8 +85,6 @@ textarea, input { outline: none; } /* osx */
 		position: relative;
 		display: block;
 		width: 100%;
-		height: 100%;
-		min-width: 300px;
 	}
 
 /* Listbox */