:root {

  /* ===== == = === 20em (320px) === = == ===== */
  @custom-media --xs-screen only screen and (width >= 20em);

  /* ===== == = === 30em (480px) === = == ===== */
  @custom-media --sm-screen only screen and (width >= 30em);

  /* ===== == = === 37.5em (600px) === = == ===== */
  @custom-media --md-screen only screen and (width >= 37.5em);

  /* ===== == = === 48em (768px) === = == ===== */
  @custom-media --lg-screen only screen and (width >= 48em);

  /* ===== == = === 56.25em (900px) === = == ===== */
  @custom-media --xl-screen only screen and (width >= 56.25em);

  /* ===== == = === 68.75em (1100px) === = == ===== */
  @custom-media --2x-screen only screen and (width >= 68.75em);

  /* ===== == = === 81.25em (1300px) === = == ===== */
  @custom-media --3x-screen only screen and (width >= 81.25em);

}