.acf-field-post-picker .post-preview {
  position: relative;
  margin-top: 5px;
}

.acf-field-post-picker .post-preview:not(:empty) {
  min-height: 150px;
}

.acf-field-post-picker .post-preview:not(:empty)::before {
  content: 'Loading preview...';
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.acf-field-post-picker .post-preview iframe {
  position: relative;
  z-index: 2;
  display: block;
  opacity: 0;
  height: 0;
  width: 100%;
  border: none;
  transition: all 0.5s linear;
}

.acf-field-post-picker .post-preview iframe.loaded {
  opacity: 1;
}

.acf-field-post-picker .post-preview a {
  position: absolute;
  z-index: 3;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  font-size: 2em;
  background-color: rgba(0, 0, 0, 0.5);
  color: white;
  text-decoration: none;
  text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.25s linear;
}

.acf-field-post-picker .post-preview a::after {
  display: block;
  content: "(Opens in a new window)";
  font-size: 0.5em;
}

.acf-field-post-picker .post-preview iframe.loaded + a:hover {
  opacity: 1;
}