Atom Stylesheet to support Operator and Fira Code together

style.less

/*
 * Your Stylesheet
 *
 * This stylesheet is loaded when Atom starts up and is reloaded automatically
 * when it is changed and saved.
 *
 * Add your own CSS or Less to fully customize Atom.
 * If you are unfamiliar with Less, you can read more about it here:
 * http://lesscss.org
 */
atom-work-space,
atom-text-editor {
  text-rendering: optimizeLegibility;
  font-family: "Fira Code";
  font-size: 9px;
  font-weight: 400;
  line-height: 1.4;
}

atom-panel.tool-panel {
  font-size: 0.88em;
}

atom-text-editor::shadow {
  .comment, .entity.other.attribute-name {
    font-family: "Operator Mono";
    font-size: 1.075em;
    font-style: italic;
    line-height: normal;
  }
}