RemixIconEx.Editor.font_color

You're seeing just the function font_color, go back to RemixIconEx.Editor module for more information.
Link to this function

font_color(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Editor.font_color()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M15.246 14H8.754l-1.6 4H5l6-15h2l6 15h-2.154l-1.6-4zm-.8-2L12 5.885 9.554 12h4.892zM3 20h18v2H3v-2z" />
</svg>

example usage

svg.icon {
  width: 96;
  height: 96;
}