Untitled

<?php
if (isset($_GET)){
    $error_message = $_GET["error_message"];
} else{
    $error_message = "";
}
?><!DOCTYPE html>
<!--
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To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            #error {
                color: red;
                font-weight: bold;
            }
            label {
                display: inline-block;
                width: 150px;
                font-weight: bold;
            }
        </style>
    </head>
    <body>
        <?php echo "<span id='error'>" . $error_message . "</span>"; ?>
        <form action="product_discount.php" method="post">
            <label>Product Description:</label>
            <input type="text" name="product_description"><br>
            <label>List Price:</label>
            <input type="text" name="list_price"><br>
            <label>Discount Percent:</label>
            <input type="text" name="discount_percent"><span>%</span><br>
            <label>&nbsp;</label>
            <input type="submit" value="Calculate Discount"><br>
        </form>
    </body>
</html>