header.scroll {
  z-index: 100;
}

footer .w-80 .w-100 {
  float: left;
}

@media (max-width: 540px) {
  footer .w-80 .w-100 {
    float: none;
  }

  footer .w-25 {
    width: 50% !important;
  }

  footer .w-50 {
    width: 100% !important;
  }
}