New output css class for md2html (#172)

* New output css class for md2html

* margins and padding taken from Highlights.jl

src/formatters.jl

@@ -122,7 +122,7 @@ end
 const md2html = JMarkdown2HTML("Julia markdown to html", Dict{Symbol,Any}(
         :codestart => "\n",
         :codeend=> "\n",
-        :outputstart=> "<pre class=\"hljl\">",
+        :outputstart=> "<pre class=\"output\">",
         :outputend=> "</pre>\n",
         :fig_ext=> ".png",
         :mimetypes => ["image/png", "image/jpg", "image/svg+xml",

templates/skeleton_css.css

@@ -515,6 +515,14 @@ pre.sourceCode.julia {
   border-radius: 4px;
 }
 
+pre.output {
+  filter : brightness(90%);
+  border : none;
+  /* matching hard-coded values in Highlights.jl */
+  margin : 5px;  
+  padding : 5px;
+}
+
 pre.julia-error {
   color : red
 }