div {
  width: 700px;
  margin: 50px auto;
}
div > #content {
  margin-bottom: 30px;
}
div > #content > li {
  line-height: 40px;
  padding-left: 30px;
}
div > #content > li:nth-of-type(2n) {
  background-color: #ccc;
}
div > .btn {
  margin: 0 auto;
}
div > .btn > li {
  float: left;
  height: 40px;
  line-height: 38px;
  padding: 0 10px;
  border-radius: 5px;
  border: 1px solid #ccc;
  margin: 5px;
  overflow: hidden;
  cursor: pointer;
}
div > .btn > li > ul {
  height: 40px;
}
div > .btn > li > ul > li {
  float: left;
  border-radius: 5px;
  border: 1px solid #ccc;
  text-align: center;
  line-height: 38px;
  width: 40px;
  margin: 0 5px;
  cursor: pointer;
}
div > .btn > li > ul > .active {
  background-color: #E42f61;
  color: #fff;
  height: 40px;
  border: none;
}
div > .btn > li:nth-of-type(3) {
  border: none;
  padding: 0;
  cursor: none;
}