* {
  margin: 0 auto;
  padding: 0;
  font-family: "黑体";
}
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: normal;
}
a {
  text-decoration: none;
}
li {
  list-style: none;
}
img {
  border: none;
}
div {
  margin: auto;
}
body {
  width: 10rem;
}
.lf {
  float: left;
}
.rt {
  float: right;
}
header img {
  display: block;
  width: 100%;
}
_2:after {
  display: block;
  clear: both;
  content: "";
  visibility: hidden;
  height: 0;
}
_2 {
  zoom: 1;
}