How to implement the given textarea?

Question

css

Answer 1

<div class='custom-textarea'>
  <textarea class='custom-textarea__textarea'></textarea>
  <div class='custom-textarea__buttons'>
    <button class='custom-textarea__btn js-custom-textarea-attach-click'>
      <!-- иконка скрепки -->
    </button>
    <button class='custom-textarea__btn js-custom-textarea-send-click'>
      <!-- иконка самолета -->
    </button>
  </div>
</div>

Bring the styles to the desired appearance, with the help of JS classes you hang the necessary logic.