ul {
  max-height: 700px;
  overflow-y: auto;
  padding-left: 0.5rem;
}
ul i {
  font-size: 1.5rem;
  border: 1px solid #f1f1f1;
  padding: 0.2rem;
  margin: 0.3rem;
  cursor: pointer;
}
ul i.active,
ul i:hover {
  border-radius: 2px;
  border-color: #4a4a48;
  background-color: #4a4a48;
  color: #fff;
  -webkit-transition: all 0.3s;
  transition: all 0.3s;
}
ul li {
  list-style: none;
  float: left;
  width: 5%;
  text-align: center;
  cursor: pointer;
  color: #555;
  -webkit-transition: color 0.3s ease-in-out, background-color 0.3s ease-in-out;
  transition: color 0.3s ease-in-out, background-color 0.3s ease-in-out;
  position: relative;
  margin: 3px 0;
  border-radius: 4px;
  background-color: #fff;
  overflow: hidden;
  padding: 10px 0 0;
}