Update css.inc

doc/css.inc

@@ -2,13 +2,16 @@
 
 .. raw:: html
 
-    <style> .black {color:black} </style>
-    <style> .blue {color:blue} </style>
-    <style> .red {color:red} </style>
-    <style> .green {color:green} </style>
-    <style> .pink {color:pink} </style>
+    <style type="text/css">
+    .black {color:black};
+    .blue  {color:blue};
+    .red   {color:red};
+    .green {color:green};
+    .pink  {color:pink};
+    </style>
+
+.. role:: black
 .. role:: blue
 .. role:: red
 .. role:: green
 .. role:: pink
-.. role:: black