html {
    font-family: sans-serif;
    -webkit-text-size-adjust: 100%;/*字体缩放样式*/
    -ms-text-size-adjust: 100%;/*字体缩放样式（IE）*/
}

* {
    margin: 0;
    padding: 0;
    -webkit-box-sizing: inherit;
    -moz-box-sizing: inherit;
    box-sizing: border-box;
}

a {
    text-decoration: none;
    cursor: pointer;
    outline: none;
    color: #979797;
}

li {
    list-style: none;
}

input {
    outline: none;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

.clear:after {
    clear: both;
    content: "";
    display: block;
}

.middle:before {
    content: "";
    display: inline-block;
    vertical-align: middle;
    height: 100%;
}