reset.css

html,
body {
    height: 100%;
}
body {
    line-height: 1;
}
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
}

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

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


/*font-size: 100%;  如果父元素中尺寸没设置，就会一直追溯到body和html上的字体设置,比方说html{font:12px/1.5 Tahoma, Helvetica, Arial,sans-serif;color:#747474} 100%就是12px；*/

address,
cite,
dfn,
em,
var {
    font-style: normal;
}

code,
kbd,
pre,
samp {
    font-family: couriernew, courier, monospace;
}

small {
    font-size: 12px;
}

ul,
ol {
    list-style: none;
}


/* 去除列表的原点 */

fieldset,
img {
    border: 0;
}


/* 去除边框 */

a {
    text-decoration: none;
}


/* 去除a标签默认的下划线 */

a:hover {
    text-decoration: underline;
}


/* 设置a标签划过的时候下划线 */

sup {
    vertical-align: text-top;
}

sub {
    vertical-align: text-bottom;
}

button,
input,
select,
textarea {
    font-size: 100%;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}


/* 设置table边框很是方便的 */


/* 设置上标和下标  */


/* 清除浮动 防止父级塌陷 */

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

.clearfix:after {
    clear: both;
}