JSFiddle - React, Tailwind, and code Playground

HTML

<form name="forma1" method="POST">
<table border="1" cellpadding="1" cellspacing="1">
    <tbody>
        <tr>
            <td>Площадь</td>
            <td>Стоимость</td>
        </tr>
        <tr>
            <td><input type="number" name="A1" value="0" min="0" max="4000000" step="0.001"></td>
            <td><input type="text" size="8" maxlength="8" name="rescena1"></td>
        </tr>
    </tbody>
</table>
   <input type="button" value="Вычислить" onClick="areaOfTriangle1(forma1);">
   <input type="reset" value="Отменить">
</form>

<button>СКОПИРОВАТЬ ФОРМУ</button>

CSS

button {
    background-color: red;
    color: white;
    font-weight: bold;
    margin: 10px;
    width: 200px;
    padding: 5px;
}

JavaScript

$('button').on('click', function() {
    var $form = $('form').eq(0);
    $form.clone().insertAfter($form);
});