JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset>
    <div class="textarea__wrapper">
      <textarea></textarea>
    </div>
    
    <input>
</fieldset>

CSS

.textarea__wrapper {
  border: 1px solid red;
  width: 500px;
}

textarea {
  max-width: 100%;
  box-sizing: border-box;
 }