invoke css

IPython/html/static/style/ipython.min.css

@@ -545,6 +545,7 b' div.input_area > div.highlight > pre {'
 .CodeMirror {
   line-height: 1.21429em;
   /* Changed from 1em to our global default */
+  font-size: 14px;
   height: auto;
   /* Changed to auto to autogrow */
   background: none;

IPython/html/static/style/style.min.css

@@ -8168,12 +8168,14 b' ul#new-notebook-menu {'
   }
 }
 @media print {
-  #texteditor-backdrop #texteditor-container .CodeMirror-gutter {
+  #texteditor-backdrop #texteditor-container .CodeMirror-gutter,
+  #texteditor-backdrop #texteditor-container .CodeMirror-gutters {
     background-color: #ffffff;
   }
 }
 @media not print {
-  #texteditor-backdrop #texteditor-container .CodeMirror-gutter {
+  #texteditor-backdrop #texteditor-container .CodeMirror-gutter,
+  #texteditor-backdrop #texteditor-container .CodeMirror-gutters {
     background-color: #ffffff;
   }
 }
@@ -8455,6 +8457,7 b' div.input_area > div.highlight > pre {'
 .CodeMirror {
   line-height: 1.21429em;
   /* Changed from 1em to our global default */
+  font-size: 14px;
   height: auto;
   /* Changed to auto to autogrow */
   background: none;