Fix fat cursor

lib/codemirror.css

@@ -46,7 +46,7 @@
 .CodeMirror div.CodeMirror-secondarycursor {
   border-left: 1px solid silver;
 }
-.cm-keymap-fat-cursor div.CodeMirror-cursor {
+.CodeMirror.cm-keymap-fat-cursor div.CodeMirror-cursor {
   width: auto;
   border: 0;
   background: transparent;
@@ -54,7 +54,7 @@
   filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#6600c800, endColorstr=#4c00c800);
 }
 /* Kludge to turn off filter in ie9+, which also accepts rgba */
-.cm-keymap-fat-cursor div.CodeMirror-cursor:not(#nonsense_id) {
+.CodeMirror.cm-keymap-fat-cursor div.CodeMirror-cursor:not(#nonsense_id) {
   filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
 }
 /* Can style cursor different in overwrite (non-insert) mode */