%comment-icon {
  @extend %default-font;
  font-weight: bold;
  -webkit-font-smoothing: auto;

  position: relative;
  display: inline-block;
  min-width: 1.4em;
  height: 1.1em;
  border-radius: 0.25em;
  padding: 0 0.2em;
  line-height: 1;
  vertical-align: text-top;
  text-align: center;
  -moz-box-sizing: border-box; box-sizing: border-box;
}

%comment-icon-triangle {
  position: absolute;
  display: block;

  top: 1em;
  left: 20%;
  border-style: solid;
  border-width: 0.43em 0.55em 0 0;
  border-color: transparent;
}

%comment-icon {
  @extend %default-font;
  font-weight: bold;
  -webkit-font-smoothing: auto;

  position: relative;
  display: inline-block;
  min-width: 1.4em;
  height: 1.1em;
  border-radius: 0.25em;
  padding: 0 0.2em;
  line-height: 1;
  vertical-align: baseline;
  top: -0.15em;
  text-align: center;
  -moz-box-sizing: border-box; box-sizing: border-box;
}

%comment-icon-triangle {
  position: absolute;
  display: block;

  top: 1em;
  left: 20%;
  border-style: solid;
  border-width: 0.43em 0.55em 0 0;
  border-color: transparent;
}

Use vertical-align baseline as this doesn't depend on the font and looks better in most cases
Use vertical-align baseline as this doesn't depend on the font and looks better in most cases
