jquery.mentions.css in Open Social 8.9

.mentions-input {
  position: relative;
  background-color: white;
}

.mentions-input .input {
  overflow: hidden;
  position: relative;
}

.mentions-input .highlighter {
  position: absolute;
  left: 0;
  right: 0;
  color: transparent;
  overflow: hidden;
  border-style: solid;
  border-color: transparent;
}

.mentions-input .highlighter-content {
    position: relative;
}

.mentions-input .highlighter-content strong {
  font-weight: inherit;
  background-color: #e6e6e6;
  display: inline;
  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0);
}

[data-mention] {
  background-color: #e6e6e6;
  filter: progid:DXImageTransform.Microsoft.Alpha(opacity=0);
}