.block-editor-block-list__layout .spacer-responsive {
  padding: 10px;
  background-color: #f2f2f2;
}

.block-editor-block-list__layout .spacer-responsive.medium {
  padding: 20px;
  background-color: #f2f2f2;
}

.block-editor-block-list__layout .spacer-responsive.large {
  padding: 40px;
  background-color: #f2f2f2;
}