.wp-custom-header {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0px;
  left: 0px;
}
.wp-custom-header img {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  margin: 0px;
  min-width: initial;
  min-height: initial;
  -o-object-fit: cover;
  object-fit: cover;
}