h2{ color: red}
nav{
  position: sticky;
  
}
nav ul{
  list-style-type: none;
}

nav ul::after{
  content: "";
  display: table;
  clear: both;
}

nav a{
  display: block;
  text-decoration: none;
  color: black;
  border-bottom: 2px solid transparent;
  padding: 10px 0px;
}