JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <form>
    <div>Form mavi kenarlıkla çevrelenmiştir</div>
    <label>Oğul:</label>
    <input name="isim" />

    <fieldset>
      <label>Torun:</label>
      <input name="haber" />
    </fieldset>

  </form>
  Kardeş form: <input name="none" />
<script></script>

CSS

body { font-size:14px; }
  form { border:2px blue solid; padding:2px; margin:0; 
         background:#efe; }
 div { color:green; }
  fieldset { margin:1px; padding:3px; }

JavaScript

$("form input:siblings").css("border", "2px dotted red");