nav {
  position: relative;
  border-right: 3px gray;
}

nav a, nav a:visited{
  display: inline-block;
  background-color: #4e7d57;
  color: white;
  padding : 1em 1.5em;
  text-decoration: none;
  transition: background-color 0.5s;
}

nav a {
  width: 100%;
}

nav a:hover, nav a:active, nav a:focus {
  background-color: #66777d;
}

footer{
  padding: 2rem;
  text-align: center;
  background-color: #4e7d57;
  color: white;
}