scss select before code example

Example 1: scss ::after

p {
    margin: 2em auto;

    > a {
        color: red;
    }

    &:before {
        content: "";
    }

    &:after {
        content: "* * *";
    }
}

Example 2: css before is not working

.chart ul:after{
  content: "";
  border:1px solid #f30;
}