#menu ul {
  margin-left: -2.5em;
}

#menu li {
  list-style-type: none;
  float: left;
  width: 5em;
  text-align: center;
}

#menu a {
  text-decoration: none;
  color: black;
  display: block;
  box-shadow: 5px 5px 5px gray;
  background-color: #EEEEFF;
}

#menu a:hover {
  border: 3px #EEEEFF inset;
}