reset.css

* {
    -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;
}

body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
button,
textarea,
p,
blockquote,
th,
td {
    margin: 0;
    padding: 0;
}

body {
    background: #fff;
    color: #555;
    font-size: 14px;
    font-family: "Arial", "Microsoft YaHei", "黑体", "宋体", sans-serif;
}

td,
th,
caption {
    font-size: 14px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: normal;
    font-size: 100%;
}

address,
caption,
cite,
code,
dfn,
em,
strong,
th,
var {
    font-style: normal;
    font-weight: normal;
}

a {
    color: #555;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    border: none;
    vertical-align: middle;
}

ol,
ul,
li {
    list-style: none;
}

input,
textarea,
select,
button {
    font: 14px "Arial", "Microsoft YaHei", "黑体", "宋体", sans-serif;
}

table {
    border-collapse: collapse;
}

html {
    overflow-y: scroll;
}


// 清除浮动
.clearfix:before,
.clearfix:after {
    content: " ";
    display: inline-block;
    height: 0;
    clear: both;
    visibility: hidden;
}

.clearfix {
    *zoom: 1;
}

/*公共类*/
.fl {
    float: left
}

.fr {
    float: right
}

.al {
    text-align: left
}

.ac {
    text-align: center
}

.ar {
    text-align: right
}

.hide {
    display: none
}