Textarea to fill a parent container exactly, with padding

Question

I want a </code> to completely fill an absolutely-sized parent container, with padding in the textarea. I have this working for Chrome using the follow <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-5408099190056760" data-ad-slot="7305827575" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> </div> <div class="fly-panel detail-box" id="flyReply"> <fieldset class="layui-elem-field layui-field-title" style="text-align: center;"> <legend>4条回答</legend> </fieldset> <ul class="jieda" id="jieda"> <li data-id="111" class="jieda-daan"> <a name="item-1111111111"></a> <div class="detail-about detail-about-reply"> <a class="fly-avatar" href=""> <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000043.jpg" alt=" 小蘑菇 "> </a> <div class="fly-detail-user"> <a href="" class="fly-link"> <cite> 小蘑菇</cite> </a> <span>(楼主)</span> </div> <div class="detail-hits"> <span>2020-12-07 17:59</span> </div> </div> <div class="detail-body jieda-body photos"> <p> <p>I have a solution where you can have 100% width and height with padding in the text area. I use negative margins to achieve the desired effect.</p> <p>HTML:</p> <pre><code><div class="container"> <textarea class="text"/>