Гнездящееся нахальство

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/*  nesting styles inside the parent element. 
& will refer to the parent which is the anchor tag a.*/ 
li {
    margin-right: 2.5rem;

    a {
      text-decoration: none;
      color: #707070;

      &:hover {
        color: #069c54;
      }
    }
  }