.wpcbc-code-wrap {
  position: relative;
  display: block;
}

/* 右上角按钮 */
.wpcbc-copy-btn {
  position: absolute;
  top: 0.5em;
  right: 0.5em;
  z-index: 5;

  font-size: 12px;
  line-height: 1;
  padding: 0.35em 0.6em;

  cursor: pointer;
  border: 1px solid rgba(0,0,0,.15);
  border-radius: 4px;
  background: rgba(255,255,255,.9);
  color: inherit;
}

/* 可选：避免按钮盖住代码第一行（按需启用）
.wpcbc-code-wrap pre.wp-block-code {
  padding-top: 2.2em;
}
*/