.waiting {
  background: #FFFFFF url("https://gfcglobal.com.tr/site/assets/files/1/gfcglobal-logo.0x200.png");
  background-size: 180px;
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-position: center;
  visibility: hidden;
  position:fixed;
  top: 0;left: 0;right: 0;bottom: 0;opacity: 0;
  z-index: 1090;
}

.waiting.active {
  opacity: 0.7; visibility: visible;
}

.dropzone.dz-drag-hover {
    background-color: #e0f3ff;
    border-color: #0d6efd;
}