nav {
  background: #2c3e50;
  padding: 12px 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.navbar {
  list-style: none;
  display: flex;
  justify-content: center;
  margin: 0;
  padding: 0;
}

.navbar li {
  margin: 0 20px;
}

.navbar a {
  text-decoration: none;
  color: #ecf0f1;
  font-weight: bold;
  transition: color 0.3s, border-bottom 0.3s;
}

.navbar a:hover {
  color: #1abc9c;
  border-bottom: 2px solid #1abc9c;
  padding-bottom: 4px;
}