body .edui-default .edui-toolbar .edui-button.edui-for-gapfilling .edui-icon {
  width: 100px !important;
  border: 1px solid #ddd;
  border-radius: 4px;
  background-color: #fff !important;
  outline: none !important;
}
.edui-for-gapfilling .edui-icon::after {
  content: "点击插入填空题";
  position: absolute;
  left: 6px;
  color: #333;
  font-size: 12px;
}