JSFiddle - React, Tailwind, and code Playground

HTML

<?php
$inicial = $_GET['inicial'];
$final = $_GET['final'];

//Verificar se o valor final é menor que o valor inicial
if ($inicial > $final){
        echo "O valor inicial não pode ser maior que o valor final.";
        echo "<BR>";
        exit;

}
?>

	<form name="qqcoisa" method="get" onsubmit="return cenas()">

		<div class="sortearer">
		<div class="col-md-6">
		<div align="center">
		<img src="CM Fafe.png" alt="brasão do municipio" height="85"> 
		</div> 
  	<h2><center>Sorteio</center></h2>
  	<table class="table">
    		<thead>
      			<tr>
        			<th><center>N.º Inicial</center></th>
        		<th><center>N.º Final</center></th>
      			</tr>
    		</thead>
   		<tbody>
      			<tr>
        			<td><center><input type="number" id="inicial" name="inicial" size="5" maxlength="4" min="1" max="9999" placeholder="0"/></center></td>
        			<td><center><input type="number" id="final" name="final" size="5" maxlength="4" min="1" max="9999" placeholder="0"/></center></td>
      			</tr>
		</tbody>
      			<tr>
				<td  colspan="2">
				<div>
  				<center><button type="submit" name="gerar" class="btn btn-primary btn-lg btn-block" onClick="<?php sortear();?>"><b>Gerar</b></button></center>
				</div>
				</td>
      			</tr>
		<tbody>
      			<tr>
      			</tr>
    			</tbody>
  	</table>
	</div>
	</div>

	</br>

</form>

<?php	
   function sortear($prevItems, $number) {
     for ($k=0; $k<sizeof($prevItems); $k++) {
       if ($prevItems[$k] == $number)
          return true;
     }
       return false;
   }
   for ($i=0; $i<=9; $i++) {       
      $num[$i] = rand($_GET['inicial'],$_GET['final']);      
      while (sortear($prevItems, $num[$i])) {          
         $num[$i] = rand($_GET['inicial'],$_GET['final']);       
      }       
    $prevItems[$i] = $num[$i];
    }
    
   sort($num);

?> 


<script type="text/javascript">
function Nova()
{
location.href=" pdf.php"
}
</script>

<form method="post" action="pdf.php">

<div...