/* For the label of equations to be aligned on the right of them (added by NM on 21.01.2021) */

span.eqno {
    margin-left: 5px;
    margin-top: 15px;
    float: right;
    /* position the number above the equation so that :hover is activated */
    z-index: 1;
    position: relative;
}

span.eqno .headerlink {
  display: none;
  visibility: hidden;
}

span.eqno:hover .headerlink {
  display: inline-block;
  visibility: visible;
}