github markdown css+script with syntax highlighting. Works with http://markedapp.com

gh-like.css

/* 
   Some simple Github-like styles, with syntax highlighting CSS via Pygments.
*/
body{
	font-family: helvetica, arial, freesans, clean, sans-serif;
	color: #333;
	background-color: #fff;
	border: none;
	line-height: 1.5;
	margin: 2em 3em;
	text-align:left;
}
pre{
	background-color: #eee;
	padding: 10px;
	-webkit-border-radius: 5px;
	-moz-border-radius: 5px;
	border-radius: 5px;
	overflow: auto;
}
code{
	background-color: #eee;
	padding: 1px 3px;
	-webkit-border-radius: 2px;
	-moz-border-radius: 2px;
	border-radius: 2px;	
}
li p{
	margin: 0.3em;
}
li{
	list-style-type: disc;
}
a:link, a:visited{
	color: #33e;
	text-decoration: none;
}
a:hover{
	color: #00f;
	text-shadow:1px 1px 2px #ccf;
	text-decoration:underline;
}
h1{
	color: #999;
	font-weight: bold;
}
h2{
	border-bottom: 1px dotted #aaa;
	margin-bottom: 1em;
	color: #333;
}
h3{
	color: #666;
}
.shadow{
	-webkit-box-shadow:0 5px 15px #000;
	-moz-box-shadow:0 5px 15px #000;
	box-shadow:0 5px 15px #000;		
}


.hll { background-color: #ffffcc }
.c { color: #888888 } /* Comment */
.err { color: #a61717; background-color: #e3d2d2 } /* Error */
.k { color: #008800; font-weight: bold } /* Keyword */
.cm { color: #888888 } /* Comment.Multiline */
.cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.c1 { color: #888888 } /* Comment.Single */
.cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.ge { font-style: italic } /* Generic.Emph */
.gr { color: #aa0000 } /* Generic.Error */
.gh { color: #303030 } /* Generic.Heading */
.gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.go { color: #888888 } /* Generic.Output */
.gp { color: #555555 } /* Generic.Prompt */
.gs { font-weight: bold } /* Generic.Strong */
.gu { color: #606060 } /* Generic.Subheading */
.gt { color: #aa0000 } /* Generic.Traceback */
.kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.kp { color: #008800 } /* Keyword.Pseudo */
.kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.kt { color: #888888; font-weight: bold } /* Keyword.Type */
.m { color: #0000DD; font-weight: bold } /* Literal.Number */
.s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.na { color: #336699 } /* Name.Attribute */
.nb { color: #003388 } /* Name.Builtin */
.nc { color: #bb0066; font-weight: bold } /* Name.Class */
.no { color: #003366; font-weight: bold } /* Name.Constant */
.nd { color: #555555 } /* Name.Decorator */
.ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.nf { color: #0066bb; font-weight: bold } /* Name.Function */
.nl { color: #336699; font-style: italic } /* Name.Label */
.nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.py { color: #336699; font-weight: bold } /* Name.Property */
.nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.nv { color: #336699 } /* Name.Variable */
.ow { color: #008800 } /* Operator.Word */
.w { color: #bbbbbb } /* Text.Whitespace */
.mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.bp { color: #003388 } /* Name.Builtin.Pseudo */
.vc { color: #336699 } /* Name.Variable.Class */
.vg { color: #dd7700 } /* Name.Variable.Global */
.vi { color: #3333bb } /* Name.Variable.Instance */
.il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */

ghmarkdown.rb

#!/usr/bin/ruby
#  Github-flavored markdown to HTML, in a command-line util.
#
#  $ cat README.md | ./ghmarkdown.rb
#
#  Notes:
#
#  You will need to install Pygments for syntax coloring
#
#    $ sudo easy_install pygments
#
#  Install the gems redcarpet, albino, and nokogiri
#
#  To work with http://markedapp.com/ I also had to
#    $ sudo ln -s /usr/local/bin/pygmentize /usr/bin
#
require 'rubygems'
require 'redcarpet'
require 'albino'
require 'nokogiri'

def markdown(text)
  options = [:hard_wrap, :filter_html, :autolink, :no_intraemphasis, :fenced_code, :gh_blockcode]
  html = Redcarpet.new(text, *options).to_html 
  syntax_highlighter(html)
end

def syntax_highlighter(html)
  doc = Nokogiri::HTML(html)
  doc.search("//pre[@lang]").each do |pre|
    pre.replace Albino.colorize(pre.text.rstrip, pre[:lang])
  end
  doc.to_s # doc.at_css("body").inner_html.to_s
end

puts markdown(ARGF.read)

Do you know how can i do if i don't want <html> and <body> tags ?

Before:

<!DOCTYPE html>
<html><body>
<p>Hello</p>
</body></html>

After:

<p>Hello</p>

No clue: I don't really know what you're asking, but you might want to comment on the original that I forked from.