经过逐个查找，是几个最常见的标签产生了冲突，删除(覆盖)即可。列出如下：

body {
 font-family:"Helvetica Neue", Helvetica, Arial, sans-serif;
 font-size: 14px;
 line-height: 1.42857143;
 color: #333;
 background-color: #fff;
}
* {
 -webkit-box-sizing: border-box;
 -moz-box-sizing: border-box;
 box-sizing: border-box;
}
*:before,
*:after {
 -webkit-box-sizing: border-box;
 -moz-box-sizing: border-box;
 box-sizing: border-box;
}

h1,
.h1,
h2,
.h2,
h3,
.h3 {
 margin-top: 20px;
 margin-bottom: 10px;
}

*{box-sizing: content-box;}

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