.about-link[href*="untappd.com"] .bi-untappd-app {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  border-radius: 0.25em;
  background: url("images/untappd.png") center / contain no-repeat;
  vertical-align: -0.2em;
}

.about-link[href*="untappd.com"] .bi-untappd-app::before {
  content: "";
}