reset.css 初始化样式

body,
h1,
h2,
h3,
h4,
h5,
h6,
hr,
p,
blockquote,
dl,
dt,
dd,
ul,
ol,
li,
pre,
form,
fieldset,
legend,
button,
input,
textarea,
th,
td {
    margin: 0;
    padding: 0
}
html {
    color: #000;
    background: #fff;
    overflow-y: scroll
}

body,
button,
input,
select,
textarea,
pre {
    font-size: 12px;
    font-family: Arial, Helvetica, STHeiti, "宋体"
}

img {
    border: 0;
    vertical-align: bottom;
}

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

.clearfix: before,
.clearfix: after {
    content: ' ';
    display: table;
}

.clearfix: after {
    clear: both;
}