header img {
  width: 100%;
  margin-top: -55px;
  position: relative;
  z-index: -1;
}
.header__img__lg {
  display: none;
}

@media all and (min-width: 1024px) {
  .header__img__lg {
    display: block;
  }

  .header__img__sm {
    display: none;
  }
}