a {
  &:link {
    color: green;
  }
  &:visited {
    color: darkgreen;
  }
  &:hover {
    color: lightgreen;
  }

}
main{
  a {
    &:link {
      text-decoration: underline;
    }
  }
  nav {
    a {
      &:link {
        text-decoration: none;
      }
    }
  }
}
footer {
  padding:1rem;
  text-align:right;
}