.edui-for-gapfilling {
  content: '点击插入填空题';
  font-size: 14px;
  color: #333;
  border: 1px solid #ccc;
}
.gapfilling-span{
  margin:0 5px;
  color:#919191;
  user-select: none;
  pointer-events: none;
  -webkit-user-modify: read-only;
}