span.soundcite {
  background-color: rgba(0,0,0,.15);
  border-radius: 6px;
  padding: 0 5px 0 5px;
  display: inline-block;
}

span.soundcite::before {
  display: inline-block;
  content: "";
  vertical-align: -10%;
  margin-right: 0.25em;

  font-size: 0.9em;
  position: relative;
  top: -.05em;
  border: 0.5em solid transparent;
  border-left: 0.75em solid black;
}