JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head>
        <title>Input data</title>
        <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
    </head>
    <body>
        <form action="http://localhost/a_submitted.php" method="post">
            <div class="TGroupBox" id="GroupBox1">
                <fieldset id="gb1fs" style="position: absolute; top:40px; left:40px; width: 857px; height: 441px;">
                    <legend>GroupBox1</legend>
                    <div class="TPanel" id="Panel1">
                        <fieldset id="Panel1fs" style="position: absolute; top:24px; left:16px; width: 753px; height: 369px;">
                            <legend></legend>
                            <div class="TLabel" id="Label1" style="position: absolute; top:24px; left: 40px; width: 32px; height: 13px;">Label1</div>
                            <div class="TEdit" id="Edit1" style="position: absolute; top:16px; left: 152px;"><input type="text" name="Edit1" value="an edit bx" style="width: 121px; height: 21px;"></div>
                            <div class="TCheckBox" id="CheckBox1" style="position: absolute; top:24px; left: 353px;"><input type="checkbox" name="CheckBox1" value="CheckBox1Checked"> CheckBox1</div>
                            <div class="TComboBox" id="ComboBox1" style="position: absolute; top:81px; left: 40px;">
                                <select size ="1" name="ComboBox1" style="width: 145px; height: 21px;">
                                    <option value="one" selected="selected">one    </option>
                                    <option value="two">two    </option>
                                    <option value="three">three    </option>
                                </select>
                            </div>
                            <div class="TRadioGroup" id="RadioGroup1">
                                <fieldset style="position: absolute; top:81px;...

CSS

#gb1fs { border: 1px solid black; }
#Panel1fs { background-color: silver; }