/* 样式初始化   想到其他的在加*/

body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td,footer,header,nav,main {
    margin: 0;
    padding: 0;
}
ul,ol{
    list-style: none;
}
a{
    text-decoration: none;
    color: black;
    cursor: pointer;
}