/*--------------------------------------
ブロックを可視化
--------------------------------------*/
.block-library-spacer__resize-container {
  background: #666;
  position: relative;
}

.block-library-spacer__resize-container:after {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  content: "スペーサー";
  color: #ccc;
}

.block-library-spacer__resize-container.is-selected {
  background: #555;
}

p[aria-label^="空のブロック"] {
  background: #555;
  color: #fff;
}