night 主题，标题头数字显示有点不好看，直接修改 night.css 文件
h1,
h2,
h3,
h4,
h5,
h6 {
font-family: "Lucida Grande", Helvetica, sans-serif;
font-weight: normal;
clear: both;
-ms-word-wrap: break-word;
word-wrap: break-word;
margin: 0;
padding: 0;
color: #DEDEDE
}