.blue-bk-2 {
  position: absolute;
  z-index: -1;
  top: 0;
  content: '';
  height: 100%;
  width: 100%;
  background: #2A39A4;
  display: none;
}

@media (max-width: 768px) {
  .blue-bk-2 {
    /* display: block; */
    background: #fff;
}