http://net.tutsplus.com/tutorials/ruby/singing-with-sinatra-the-recall-app-2/

reset.css

/*
	HTML5 ✰ Boilerplate

	style.css contains a reset, font normalization and some base styles.

	credit is left where credit is due.
	much inspiration was taken from these projects:
		yui.yahooapis.com/2.8.1/build/base/base.css
		camendesign.com/design/
		praegnanz.de/weblog/htmlcssjs-kickstart
*/

/*
	html5doctor.com Reset Stylesheet (Eric Meyer's Reset Reloaded + HTML5 baseline)
	v1.6.1 2010-09-17 | Authors: Eric Meyer & Richard Clark
	html5doctor.com/html-5-reset-stylesheet/
*/

html, body, div, span, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
abbr, address, cite, code, del, dfn, em, img, ins, kbd, q, samp,
small, strong, sub, sup, var, b, i, dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, figcaption, figure,
footer, header, hgroup, menu, nav, section, summary,
time, mark, audio, video {
	margin:0;
	padding:0;
	border:0;
	font-size:100%;
	font: inherit;
	vertical-align:baseline;
}

article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
		display:block;
}

blockquote, q { quotes:none; }

blockquote:before, blockquote:after,
q:before, q:after { content:''; content:none; }

ins { background-color:#ff9; color:#000; text-decoration:none; }

mark { background-color:#ff9; color:#000; font-style:italic; font-weight:bold; }

del { text-decoration: line-through; }

abbr[title], dfn[title] { border-bottom:1px dotted; cursor:help; }

table { border-collapse:collapse; border-spacing:0; }

hr { display:block; height:1px; border:0; border-top:1px solid #ccc; margin:1em 0; padding:0; }

input, select { vertical-align:middle; }

/* END RESET CSS */

/* font normalization inspired by  from the YUI Library's fonts.css: developer.yahoo.com/yui/ */
body { font:13px/1.231 sans-serif; *font-size:small; } /* hack retained to preserve specificity */
select, input, textarea, button { font:99% sans-serif; }

/* normalize monospace sizing
 * en.wikipedia.org/wiki/MediaWiki_talk:Common.css/Archive_11#Teletype_style_fix_for_Chrome */
pre, code, kbd, samp { font-family: monospace, sans-serif; }

/*
 * minimal base styles
 */

body, select, input, textarea {
	/* #444 looks better than black: twitter.com/H_FJ/statuses/11800719859 */
	color: #444;
	/* set your base font here, to apply evenly */
	/* font-family: Georgia, serif;  */
}

/* headers (h1,h2,etc) have no default font-size or margin. define those yourself. */
h1,h2,h3,h4,h5,h6 { font-weight: bold; }

/* always force a scrollbar in non-IE: */
html { overflow-y: scroll; }

/* accessible focus treatment: people.opera.com/patrickl/experiments/keyboard/test */
a:hover, a:active { outline: none; }

a, a:active, a:visited { color: #607890; }
a:hover { color: #036; }

ul, ol { margin-left: 2em; }
ol { list-style-type: decimal; }

/* remove margins for navigation lists */
nav ul, nav li { margin: 0; list-style:none; list-style-image: none; }

small { font-size: 85%; }
strong, th { font-weight: bold; }

td { vertical-align: top; }

/* set sub, sup without affecting line-height: gist.github.com/413930 */
sub, sup { font-size: 75%; line-height: 0; position: relative; }
sup { top: -0.5em; }
sub { bottom: -0.25em; }

pre {
	/* www.pathf.com/blogs/2008/05/formatting-quoted-code-in-blog-posts-css21-white-space-pre-wrap/ */
	white-space: pre; white-space: pre-wrap; white-space: pre-line; word-wrap: break-word;
	padding: 15px;
}

textarea { overflow: auto; } /* www.sitepoint.com/blogs/2010/08/20/ie-remove-textarea-scrollbars/ */

.ie6 legend, .ie7 legend { margin-left: -7px; } /* thnx ivannikolic! */

/* align checkboxes, radios, text inputs with their label by: Thierry Koblentz tjkdesign.com/ez-css/css/base.css  */
input[type="radio"] { vertical-align: text-bottom; }
input[type="checkbox"] { vertical-align: bottom; }
.ie7 input[type="checkbox"] { vertical-align: baseline; }
.ie6 input { vertical-align: text-bottom; }

/* hand cursor on clickable input elements */
label, input[type="button"], input[type="submit"], input[type="image"], button { cursor: pointer; }

/* webkit browsers add a 2px margin outside the chrome of form elements */
button, input, select, textarea { margin: 0; }

/* colors for form validity */
input:valid, textarea:valid   {  }
input:invalid, textarea:invalid {
			border-radius: 1px; -moz-box-shadow: 0px 0px 5px red; -webkit-box-shadow: 0px 0px 5px red; box-shadow: 0px 0px 5px red;
}
.no-boxshadow input:invalid, .no-boxshadow textarea:invalid { background-color: #f0dddd; }

/* These selection declarations have to be separate.
	 No text-shadow: twitter.com/miketaylr/status/12228805301
	 Also: hot pink. */
::-moz-selection{ background: #FF5E99; color:#fff; text-shadow: none; }
::selection { background:#FF5E99; color:#fff; text-shadow: none; }

/*  j.mp/webkit-tap-highlight-color */
a:link { -webkit-tap-highlight-color: #FF5E99; }

/* make buttons play nice in IE:
	 www.viget.com/inspire/styling-the-button-element-in-internet-explorer/ */
button {  width: auto; overflow: visible; }

/* bicubic resizing for non-native sized IMG:
	 code.flickr.com/blog/2008/11/12/on-ui-quality-the-little-things-client-side-image-resizing/ */
.ie7 img { -ms-interpolation-mode: bicubic; }

sign.rb

require 'sinatra' 
require 'data_mapper'
#require 'dm-sqlite-adapter'

#On the first line we’re setting up a new SQLite3 database in the current directory, named recall.db. Below that, we’re actually setting up a ‘Notes’ table in the database.
DataMapper::setup(:default,"sqlite3://#{Dir.pwd}/recall.db")

class Note
 include DataMapper::Resource 
 property :id, Serial
 property :content, Text, :required => true 
 property :complete, Boolean, :required => true, :default => false 
 property :created_at, DateTime 
 property :updated_at, DateTime 
end

#The very last line instructs DataMapper to automatically update the database to contain the tables and fields we have set, and to do so again if we make any changes to the schema.
DataMapper.finalize.auto_upgrade! 

get '/' do 
  @notes = Note.all :order => :id.desc
  @title = 'All Notes'
  erb :home
end 

post '/' do
n = Note.new 
n.content = params[:content]
n.created_at = Time.now
n.updated_at = Time.now
n.save
redirect '/'
end

get '/:id' do
  @note = Note.get params[:id]
  @title = "Edit note ##{params[:id]}"
  erb :edit
end


put '/:id' do
  n = Note.get params[:id]
  n.content = params[:content]
  n.complete = params[:complete] ? 1 : 0
  n.updated_at = Time.now
  n.save
  redirect '/'
end

get '/:id/delete' do
  @note = Note.get params[:id]
  @title = "Confirm deletion of note ##{params[:id]}"
  erb :delete
end


delete '/:id' do
  n = Note.get params[:id]
  n.destroy
  redirect '/'
end

get '/:id/complete' do
  n = Note.get params[:id]
  n.complete = n.complete ? 0 : 1 # flip it
  n.updated_at = Time.now
  n.save
  redirect '/'
end

get '/about' do 
 'a little about me'
end


not_found do 
 halt 404, 'page not found' 
end 


__END__
@@layout 
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf8">
  <title><%= @title + ' | Recall' %></title>
  <link href="/reset.css" rel="stylesheet">
  <link href="/style.css" rel="stylesheet">
</head>
<body>
  <header>
    <hgroup>
      <h1><a href="/">Recall</a></h1>
      <h2>'cause you're too busy to remember</h2>
    </hgroup>
  </header>

  <div id="main">
    <%= yield %>
  </div>

  <footer>
  </footer>
</body>
</html>

@@home
<section id="add">
  <form action="/" method="post">
    <textarea name="content" placeholder="Your note&hellip;"></textarea>
    <input type="submit" value="Take Note!">
  </form>
</section>

<% @notes.each do |note| %>
  <article <%= 'class="complete"' if note.complete %>>
    <p>
      <%= note.content %>
      <span><a href="/<%= note.id %>">[edit]</a></span>
    </p>
    <p class="links">
      <a href="/<%= note.id %>/complete">&#8623;</a>
    </p>
    <p class="meta">Created: <%= note.created_at %></p>
  </article>
<% end %>

@@edit
<% if @note %>
  <form action="/<%= @note.id %>" method="post" id="edit">
    <input type="hidden" name="_method" value="put">
    <textarea name="content"><%= @note.content %></textarea>
    <input type="checkbox" name="complete" <%= "checked" if @note.complete %>>
    <input type="submit">
  </form>
  <p><a href="/<%= @note.id %>/delete">Delete</a></p>
<% else %>
  <p>Note not found.</p>
<% end %>

@@delete
<% if @note %>
  <p>Are you sure you want to delete the following note: <em>"<%= @note.content %>"</em>?</p>
  <form action="/<%= @note.id %>" method="post">
    <input type="hidden" name="_method" value="delete">
    <input type="submit" value="Yes, Delete It!">
    <a href="/<%= @note.id %>">Cancel</a>
  </form>
<% else %>
  <p>Note not found.</p>
<% end %>

style.css

body {
	margin: 35px auto;
	width: 640px;
}

header {
	text-align: center;
	margin: 0 0 20px;
}

header h1 {
	display: inline;
	font-size: 32px;
}

header h1 a:link, header h1 a:visited {
	color: #444;
	text-decoration: none;
}

header h2 {
	font-size: 16px;
	font-style: italic;
	color: #999;
}

#main {
	margin: 0 0 20px;
}

#add {
	margin: 0 0 20px;
}

#add textarea {
	height: 30px;
	width: 510px;
	padding: 10px;
	border: 1px solid #ddd;
}

#add input {
	height: 50px;
	width: 100px;
	margin: -50px 0 0;
	border: 1px solid #ddd;
	background: white;
}

#edit textarea {
	height: 30px;
	width: 480px;
	padding: 10px;
	border: 1px solid #ddd;
}

#edit input[type=submit] {
	height: 50px;
	width: 100px;
	margin: -50px 0 0;
	border: 1px solid #ddd;
	background: white;
}

#edit input[type=checkbox] {
	height: 50px;
	width: 20px;
}

article {
	border: 1px solid #eee;
	border-top: none;
	padding: 15px 10px;
}

article:first-of-type {
	border: 1px solid #eee;
}

article:nth-child(even) {
	background: #fafafa;
}

article.complete {
	background: #fedae3;
}

article span {
	font-size: 0.8em;
}

p {
	margin: 0 0 5px;
}

.meta {
	font-size: 0.8em;
	font-style: italic;
	color: #888;
}

.links {
	font-size: 1.8em;
	line-height: 0.8em;
	float: right;
	margin: -10px 0 0;
}

.links a {
	display: block;
	text-decoration: none;
}