http://qiita.com/one-a/items/2758511326c09200fded http://css-happylife.com/archives/2012/0127_0020.php http://www7b.biglobe.ne.jp/~makandat/gg_sites/Sinatra_Diary_01.html http://www7b.biglobe.ne.jp/~makandat/gg_sites/Sinatra_Diary_01.html …