BUILD A PHP CALCULATOR

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>PHP Course</title>
</head>
    <style>
        h1{
            color:teal;
            font-weight: bold;
        }
         .container{
            width:400px;
            background-color: aqua;
            padding: 10px;
        }
        .first input{
            display: block;
        }
        .answer{
            border: 1px solid teal;
            padding: 10px;
            font-size: 16px;
            width:170px;
            margin-top: 10px;
            text-align: center;
            background: #f0f0f0;
        }
        .number{
            padding:10px;
            font-size: 15px;
        }
        .btn{
            margin-top: 10px;
            padding: 10px;
            text-align: center;
            font-size: 14px;
            background: green;
            outline: none;
            width: 100px;
            margin: auto;
            border: none;
        }
    </style>
<body>
    <center>
<form action="index.php" method="post">
   <h1>Calculator</h1>
    <div class="container">
    <div class="first input">
        <label>FIRST NUMBER</label>
        <input type="number" name="num1" required class="number">
        </div>
        <div class="first input">
            <label>Select Operator</label>
        <input type="text" name="op" class="number" required>
        </div>
        <div class="first input">
        <label>SECOND NUMBER</label>
            <input type="number" name="num2" required class="number">
        </div>
        <br>
        <button class="btn" type="submit">=</button>
        <button class="btn" onclick="reset()" type="reset">delete</button>
       
        <div class="answer">
        <?php
           $num1=$_POST['num1'];
           $num2=$_POST['num2'];
            $op=$_POST['op'];
            echo "the answer of $num1 $op $num2 is<br><br> <b>";
            switch($op){
                case "+":
                    echo $num1+$num2;
                    break;
                    case"-":
                    echo $num1-$num2;
                    break;
                    case"*":
                    echo $num1*$num2;
                    break;
                    case"/":
                    echo $num1/$num2;
                    break;
                    case"%":
                    echo $num1%$num2;
                    break;
                    case"**":
                    echo $num1**$num2;
                    break;
            }
           
            ?>
        </div>
   
    </div>
    </form>
    </center>
    <footer>
    <p style="font-size:20px; background:radial-gradient(blue, red); color:white; font-weight:bolder; text-align:center;">Designed by Richy Tech</p>
    </footer>

</body>
</html>

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