#mainMenu {
  background: #efefef;
}

.menu-collapsed {
  width: 50px;
}

#mainMenu ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333333;
  height: 100%;
}

#mainMenu li a {
  display: block;
  color: white;
  text-align: center;
  padding: 16px;
  text-decoration: none;
}

#mainMenu li a:hover {
  background-color: #111111;
}