/* no reference superscript */
.footnote-reference {
    font-size: 100% !important;  /* default is 90% */
    top: 0.0em !important;  /* default is -0.4em */
}

/* reference number in brackets */
.footnote-reference::before {
  content: '[';
}
.footnote-reference::after {
  content: ']';
}