JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<body>    
<table height="100%" width="100%" border="1">
    <tr><td>
    <form name="signup" class="signup" action="signup.php" style="border: 1px solid #000; ">
            
                <input type="text" placeholder="Email"/><br>
            
                <input type="text" placeholder="Username"/><br>
            
                <input type="password" placeholder="Password"/><br>
            
                <button type="submit">Next</button>
                
            </form>
        </td></tr>
</table>    
</body>
</html>

CSS

html{
    height: 100%;
}

body{
    height: 100%;
}