.header {
    position: fixed;
    z-index: 99;
    height: 61px;
    width: 100%;
    max-width: 720px;
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
}

.nullbox {
    height: 500px;
}

/* 
html {
    font-size: 62.5%
} */

html {background: url(../ing/bj.png) top center repeat-y #fff;background-attachment: fixed;}

body {
    min-width: 320px;
    font: 400 14px/1.5 "\5FAE\8F6F\96C5\9ED1", Helvetica;
    background: #fafafa;
    font-size: 14px;
    max-width: 720px;
    margin: 0 auto;
}

/* 基础样式 */
a {
    color: #1b1b1b;
    text-decoration: none
}

a:hover {
    color: #3ca5f6;
    text-decoration: none
}