Make your <hr> look like Medium's

hr.css

hr:after {
    display: block;
    text-align: center;
    content: "...";
    color: #333333;
    font-size: 2rem;
    height: 2rem;
    line-height: 2rem;
    clear: both;
    border: none;
}

hr {
    border: none;
    margin: 2rem;
    background: transparent;
}