.menu {
  margin: 4px;
  width: 300px;
}

.menu ul {
  margin: 0;
  padding: 0;
  z-index: 1000;
  list-style: none;
}

.menu ul li {
  position: relative;
  float: left;
  width: 168px;
  height: 25px;
  line-height: 25px;
  background: black;
}

.menu ul li a {
  display: block;
  color: white;
  font-family: 'MS Gothic';
  font-size: 13px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
}

.menu ul li:hover > a {
  color: pink;
  background: #303030;
}

.menu ul li ul {
  position: absolute;
}

.menu ul li ul li {
  overflow: hidden;
  height: 0;
  background: #505050;
}

.menu ul li:hover > ul > li {
  overflow: visible;
  height: 20px;
  transition: 0.5s;
}

.menu ul li ul li a {
  background: #505050;
}

.menu ul li ul li ul {
  top: 0;
  left: 100%;
}

.menu ul li ul li ul:before {
  position: absolute;
  top: 10px;
  left: -15px;
  content: "";
  border: 5px solid transparent;
  border-left-color: silver;
}