@-moz-document url-prefix() {
  /*
  ** On firefox the vertical metrics of the font used (simplon) is bigger than on chrome / safari.
  ** This causes some difference in elements heights. You can adjust here for firefox.
  */
  .btn-input {
    line-height: 45px;
  }
  /*
  ** Firefox requires z-index on parallax blocks but chrome will stop working if z-index is added.
  */
  .parallax-block {
    z-index: 1;
  }
  .parallax-foreground-block {
    position: relative;
    z-index: 2;
  }
}