Adjust cell background and number color after review with @minrk.

IPython/frontend/html/notebook/static/codemirror/theme/ipython.css

@@ -1,7 +1,7 b''
 
 
 .cm-s-ipython span.cm-keyword {color: #008000; font-weight: bold;}
-.cm-s-ipython span.cm-number {color: #666666;}
+.cm-s-ipython span.cm-number {color: #0A32C8;}
 .cm-s-ipython span.cm-operator {color: #AA22FF; font-weight: bold;}
 .cm-s-ipython span.cm-meta {color: #AA22FF;}
 .cm-s-ipython span.cm-comment {color: #408080; font-style: italic;}

IPython/frontend/html/notebook/static/css/notebook.css

@@ -206,7 +206,7 b' div.input_area {'
     color: black;
     border: 1px solid #ddd;
     border-radius: 3px;
-    background: #f4f4f4;
+    background: #f7f7f7;
 }
 
 div.input_prompt {