.esbt-widget {
  width: 100%;
}

.esbt-box{
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* As camadas são o "background" do próprio widget */
.esbt-layer{
  position:absolute;
  inset:0;
  background-repeat:no-repeat;
  background-size: cover;
  background-position: center center;
  display:none; /* instantâneo */
}

.esbt-layer.is-active{
  display:block; /* instantâneo */
}