<% example do %>
  nav {
    ul {
      margin: 0;
      padding: 0;
      list-style: none;
    }

    li { display: inline-block; }

    a {
      display: block;
      padding: 6px 12px;
      text-decoration: none;
    }
  }
  ===
  nav
    ul
      margin: 0
      padding: 0
      list-style: none

    li
      display: inline-block

    a
      display: block
      padding: 6px 12px
      text-decoration: none
<% end %>