A simple prime number check written using PHP, HTML and CSS I hope you will find my work useful.

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Program Listing

style.css

* {
    box-sizing: border-box;
}

body {
    font-family: "Calibri", sans-serif;
    background: #e2e1e0;
    color: #111;
}

main {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.container {
    padding: 50px;
    width: 600px;
    background: #fff;
    text-align: left;
    border-radius: 20px;
    box-shadow: 0 0 60px rgba(0,0,0,0.05);
}

h1 {
    margin: 0;
    line-height: 0.9;
}

h2 {
    margin: 0;
}

.title {
    display: block;
    margin: 0 0 40px;
    text-align: center;
}

.txtbox {
    display: block;
    background: #f1f1f1;
    width: 100%;
    margin: 0 0 20px 0;
    padding: 15px;
    border: none;
    font-size: 20px;
    border-radius: 8px;
    font-family: "Calibri", sans-serif;
    text-align: center;
}

.txtbox:hover,
.txtbox:focus {
    background: #e0e0e0;
}

.btnWrapper {
    display: inline-flex;
}

.btn {
    background: #673ab7;
    color: #fff;
    padding: 15px;
    width: 250px;
    opacity: 0.9;
    outline: none;
    font-size: 20px;
    text-transform: uppercase;
    border: none;
    text-decoration: none;
    text-align: center;
    font-family: "Calibri", sans-serif;
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.btn:hover {
    opacity: 1;
}

.btnReset {
    background: #ff5722;
    border-radius: 8px 0 0 8px;
}

.btnConvert {
    border-radius: 0 8px 8px 0;
}

.answer {
    width: 100%;
    padding: 20px;
    text-align: center;
    font-size: 25px;
    font-weight: bold;
    background: #9e9e9e;
    color: #fff;
    line-height: 1;
    margin-top: 20px;
    border-radius: 8px;
}

index.php

<?php
    $out = $input = "";
    if ($_POST) {
        $input=$_POST['txtNum'];

        for ($i = 2; $i <= $input-1; $i++) {
            if ($input % $i == 0) {
                $value= true;
            }
        }
        if (empty($value) && $input != 1) {
            $out = '<div class="answer">'.$input.' is a Prime Number </div>';
        }  else {
            $out = '<div class="answer">'.$input.' is not a Prime Number</div>';
        }
    }
?>
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Prime Number Checker in PHP</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <main>
            <div class="container">
                <div class="title">
                    <h1>Prime Number Checker in PHP</h1>
                    <h2>&#187; Jake R. Pomperada, MAED-IT, MIT &#171;</h2>
                </div>

                <div class="container-wrapper">
                    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" class="frmChecker">
                        <input type="number" class="txtbox" name="txtNum" id="txtNum" value="<?php echo $input; ?>" placeholder="Input a number" required autofocus>
                        
                        <div class="btnWrapper">
                            <a href="index.php" class="btn btnReset" name="btnReset">Reset</a>
                            <button type="submit" class="btn btnConvert" name="btnConvert">Check</button>
                        </div>

                        <?php echo $out; ?>
                    </form>
                </div>
            </div>
        </main>
    </body>
</html>
https://www.youtube.com/watch?v=E_iiPCZ25B8
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