重置样式文件

 <style>
    /* 清除内外边距 */
    body,
    h1,
    h2,
    h3,
    h4,
    h5,
    h6,
    hr,
    p,
    dl,
    dt,
    dd,
    ul,
    ol,
    li,
    pre, 
    fieldset,
    button, 
    input, 
    textarea, 
    th, 
    td {
        margin: 0;
        padding: 0;
    }
    /* 设置默认字体 */
    body,
    button,
    input,
    select,
    textarea {
        font: 12px/1.3 "Microsoft YaHei",Tahoma, Helvetica, Arial, "\5b8b\4f53"， sans-serif;
        color: #333;
    }
    h1 {
        font-size: 18px;
    }
    h2 {
        font-size: 16px;
    }
    h3 {
        font-size: 14px;
    }
    h4, h5, h6 {
        font-size: 100%;
    }
    /* 斜体扶正 */
    address, cite, dfn, em, var, i {
        font-style: normal;
    }
    /* 粗体扶细 */
    b, strong {
        font-weight: normal;
    }
    /* 统一等宽字体 */
    code, kbd, pre, samp, tt {
        font-family: "Courier New", Courier, monospace;
    }
    /* 小于12px的中文很难阅读，让small正常化 */
    small {
        font-size: 12px;
    }
    /* 重置列表元素 */
    ul, ol {
        list-style: none;
    }
    /* 重置文本格式元素 */
    a {
        text-decoration: none;
        color: #666;
    }
    /* 重置表单元素 */
    legend {
        color: #000; /* for ie6 */
    }
    fieldset, img {
        border: none;
    }
    button, input, select, textarea {
        font-size: 100%; /* 在ie下能继承字体大小 */
    }
    /* 重置表格元素 */
    table {
        border-collapse: collapse;
        border-spacing: 0;
    }
    /* 重置hr */
    hr {
        border: none;
        height: 1px;
    }
    /* 让非IE浏览器默认也显示垂直滚动条，防止因滚动条引起闪烁 */
    html {
        overflow-y: scroll;
    }
    a:link:hover {
        color: lightgreen !important;
        text-decoration: underline;
    }
    /* 去除外轮廓 */
    input, textarea, select, button {
        outline: none;
    }
    /* 去除行内元素换行符问题 */
    img {
        display: block;
        border: 0;
    }
    p {
        word-wrap: break-word;
    }
    .cls {
        clear: both;
    }
    .clear {
        clear: both;
        content: "";
        display: tble;
    }
    .clearfix {
        zoom: 1;
    }
    .clearfix:after { 
        content: "."; 
        display: block; 
        height: 0; 
        clear: both; 
        overflow: hidden; 
        visibility: visible
    }
    </style>