相关疑难解决方法(0)

.left {
  border: 1px solid red;
}
textarea {
  border: 1px solid blue;
}
.parent {
  border: 1px solid green;
}

<div class='parent'>
    <span class='left'>
        <span>one</span>
        <span>two</span>
     </span>
     <textarea></textarea>
</div>