*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
em, i {
    font-style: normal
}
li {
    list-style: none
}
img {
    /*照顾低版本浏览器，如果图片外包含链接会有边框的问题*/
    border: 0;
    /*解决图片底侧的空白缝隙问题*/
    vertical-align: middle
}
button {
    /*鼠标经过按钮变成小手*/
    cursor: pointer
}
a {
    text-decoration: none
}
body {
    /*抗文字锯齿,使文字显示更加清晰*/
    -webkit-font-smoothing: antialiased;
    /*页面背景是白色*/
    background-color: #f7f7f7;
}
.hide,
.none {
    display: none
}
/*清除浮动*/
.clearfix:after {
    visibility: hidden;
    clear: both;
    display: block;
    content: ".";
    height: 0
}
.clearfix {
    *zoom: 1
}