/* Preview */
.bue-preview {
  display: none;
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  overflow: auto;
  background-color: #ffe;
  padding: 0.5em;
}
.bue.previewing .bue-preview {
  display: block;
}
.bue.previewing .bue-textarea {
  opacity: 0;
}