a.with-icon::after {
    display: inline-block;
    content: "";
    width: 1rem;
    height: 1rem;
    vertical-align: super;
    background-size: 1rem 1rem;
}
a.scholar::after {
    background-image: url('/users/rieck/scholar.ico');
}
a.orcid::after {
    background-image: url('/users/kramer/orcid.ico');
}
a.dblp::after {
    background-image: url('/users/rieck/dblp.ico');
}
a.arxiv::after {
    background-image: url('/users/rieck/arxiv.png');
}