* {
  margin: 0;
  padding: 0;
}
body {
  font-family: "Microsoft YaHei";
}
div,
input,
ul,
li {
box-sizing: border-box;
}
li {
  list-style-type: none;
}
a {
  text-decoration: none;
  box-sizing: border-box;
}
.clearfix:after {
  display: block;
  content: ".";
  visibility: hidden;
  height: 0;
  clear: both;
}