nav{
  background-color: #BDBDBD;
}
nav a {
  background: transparent;
  padding: 2px 10px;
  color: #FFFFFF;
  border: 1px ridge #F0F0F0;
}
nav a:hover {
  color: #000000;
  border: 1px groove #606060;
}
nav a {
  text-align : center;
}
nav a:hover {
  text-align : center;
}