#nav {
  background-color: #e1eef7;
}
#nav button {
  display: inline-block;
  font-size: 18px;
  width: 88px;
  height: 32px;
  line-height: 25px;
  text-align: center;
  padding: 5px;
  border: 0;
  background-color: #e1eef7;
}
#nav .active {
  background-color: #0982a1;
  color: #fff;
}
.notice ul {
  display: none;
}
.notice ul.on {
  display: block;
}