etherpad-lite/src/static/css/pad/icons.css

@font-face {
  font-family: "fontawesome-etherpad";
  src:url("../../../static/font/fontawesome-etherpad.eot");
  src:url("../../../static/font/fontawesome-etherpad.eot?#iefix") format("embedded-opentype"),
    url("../../../static/font/fontawesome-etherpad.woff") format("woff"),
    url("../../../static/font/fontawesome-etherpad.ttf") format("truetype"),
    url("../../../static/font/fontawesome-etherpad.svg#fontawesome-etherpad") format("svg");
  font-weight: normal;
  font-style: normal;

}

[data-icon]:before,
[class^="icon-"]:before,
[class*=" icon-"]:before {
  font-family: "fontawesome-etherpad" !important;
  font-style: normal !important;
  font-weight: normal !important;
  font-variant: normal !important;
  text-transform: none !important;
  speak: none;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.buttonicon {
  width: 16px;
  height: 16px;
  display: inline-block;
  vertical-align: middle;
  border: none;
  padding: 0;
  background: none;
  font-family: "fontawesome-etherpad";
  font-size: 15px;
  font-style: normal;
  font-weight: normal;
  color: #666;
  cursor: pointer;
}

.buttonicon::-moz-focus-inner {
  padding: 0;
  border: 0
}

.buttonicon:before  {
  font-family: "fontawesome-etherpad";
}

.buttonicon:focus{
  border: 1px solid #666;
}
.buttonicon-bold:before {
  content: "\e81c";
}
.buttonicon-italic:before {
  content: "\e81d";
}
.buttonicon-underline:before {
  content: "\e817";
}
.buttonicon-strikethrough:before {
  content: "\e818";
}
.buttonicon-insertorderedlist:before {
  content: "\e816";
}
.buttonicon-insertunorderedlist:before {
  content: "\e815";
}
.buttonicon-indent:before {
  content: "\e814";
}
.buttonicon-outdent:before {
  content: "\e813";
}
.buttonicon-undo:before {
  content: "\e823";
}
.buttonicon-redo:before {
  content: "\e824";
}
.buttonicon-clearauthorship:before {
  content: "\e80d";
}
.buttonicon-settings:before {
  content: "\e833";
}
.buttonicon-import_export:before {
  content: "\e834";
}
.buttonicon-embed:before {
  content: "\e827";
}
.buttonicon-history:before {
  content: "\e837";
}
.buttonicon-chat:before {
  content: "\e829";
}
.buttonicon-showusers:before {
  content: "\e808";
}
.buttonicon-savedRevision:before {
  content: "\e835";
}