.btn {&:hover {
    color: red;
  }&:active {
color:blue;}  &:nth-child(5n+1) {
    color:blue;
  }
  &:nth-child(-n+3) { color: green;}
> li > a {   color: red}  >li>li {
  color: blue;
  }
> p + p {
    color: green;
  }
  }