Zenmode: updated main.css

doesn't update the background of code cell to grey when the zenmode is toggled.

Author: luckylsk34

src/jupyter_contrib_nbextensions/nbextensions/zenmode/main.css

@@ -14,6 +14,7 @@
     display: none !important;
 }
 
+/*
 #notebook-container {
     background-color: rgba(255, 255, 255, 0.8);
 }
@@ -22,7 +23,6 @@
     background-color: rgb(255, 255, 255);
 }
 
-/*
 .CodeMirror {
     background: #F8FCCF;
 }