Add styles for ASCII renderings and diagrams.

Author: fantasai

default.css

@@ -402,6 +402,17 @@
 	/* DL list is indented 2em, but figure inside it is not */
 	dd > div.figure, dd > figure { margin-left: -2em }
 
+	pre.ascii-art {
+		display: table; /* shrinkwrap */
+		margin: 1em auto;
+	}
+
+	pre.output {
+		margin: 1em;
+		border: solid thin silver;
+		padding: 0.25em;
+		display: table;
+	}
 
 /******************************************************************************/
 /*                             Colored Boxes                                  */