CSS Accordion +/- Buttons

.plus:after {
  content: "+";
  display: inline;
  float: right !important;
  padding-right: 20px;
  font-size: 2.1rem;
}
.plus:hover:after {
  content: "-" !important;
  font-size: 2.6rem;
}
[class*="reveal-only-trigger-"].opened .plus:after {
  content: "-" !important;
  font-size: 2.6rem;
}

/*--- HTML ---*/
<h4 style="cursor:pointer;">TEXT<span class="plus"></span></h4>