ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;
  border-right:1px solid #bbb;
}

li:last-child {
  border-right: none;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #4CAF50;
}

.footer {
   position: fixed;
   left: 0;
   bottom: 0;
   width: 100%;
   background-color: Black;
   color: white;
   text-align: center;
}

.center {
  margin-left: auto;
  margin-right: auto;
}