.section-z-index-100 {
  z-index: 100;

  .bg {
    z-index: 101;
  }

  .phone {
    z-index: 102;
  }

  > * {
    z-index: 103;
  }
}

.section-z-index-200 {
  z-index: 200;

  .bg {
    z-index: 201;
  }

  .phone {
    z-index: 202;
  }

  > * {
    z-index: 203;
  }
}

.section-z-index-400 {
  z-index: 300;

  .bg {
    z-index: 301;
  }

  .phone {
    z-index: 302;
  }

  > * {
    z-index: 303;
  }
}

.section-z-index-400 {
  z-index: 400;

  .bg {
    z-index: 401;
  }

  .phone {
    z-index: 402;
  }

  > * {
    z-index: 403;
  }
}

.section-z-index-500 {
  z-index: 500;

  .bg {
    z-index: 501;
  }

  .phone {
    z-index: 502;
  }

  > * {
    z-index: 503;
  }
}

.section-z-index-600 {
  z-index: 600;

  .bg {
    z-index: 601;
  }

  .phone {
    z-index: 602;
  }

  > * {
    z-index: 603;
  }
}

.section-z-index-700 {
  z-index: 700;

  .bg {
    z-index: 701;
  }

  .phone {
    z-index: 702;
  }

  > * {
    z-index: 703;
  }
}

.section-z-index-800 {
  z-index: 800;

  .bg {
    z-index: 801;
  }

  .phone {
    z-index: 802;
  }

  > * {
    z-index: 803;
  }
}