* {
  margin: 0;
  padding: 0;
}
html,
body {
  background: #fff;
  position: relative;
}
ul li {
  list-style: none;
}
a {
  text-decoration: none;
}
.fl {
  float: left;
}
.fr {
  float: right;
}
.clear {
  clear: both;
}
.topImg {
  width: 100%;
  height: auto;
  transition: all 0.2s linear;
}