ajax.css in Open Social 8.4

/**
 * AJAX (throbber) styling.
 */
@-webkit-keyframes glyphicon-spin {
  0% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(359deg);
            transform: rotate(359deg);
  }
}
@keyframes glyphicon-spin {
  0% {
    -webkit-transform: rotate(0deg);
            transform: rotate(0deg);
  }
  100% {
    -webkit-transform: rotate(359deg);
            transform: rotate(359deg);
  }
}

.glyphicon-spin {
  display: inline-block;
  -webkit-animation: glyphicon-spin 1s infinite linear;
          animation: glyphicon-spin 1s infinite linear;
}

a .glyphicon-spin {
  display: inline-block;
  text-decoration: none;
}

html.js .btn .ajax-throbber {
  margin-left: .5em;
  margin-right: -.25em;
}

html.js .input-group-addon .glyphicon {
  color: #777777;
  opacity: .5;
  -webkit-transition: 150ms color, 150ms opacity;
  transition: 150ms color, 150ms opacity;
}

html.js .input-group-addon .glyphicon.glyphicon-spin {
  opacity: 1;
}

html.js .ajax-new-content:empty {
  display: none !important;
}