onMouseOver

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Problem 2</title>
    <style>
        input{
            margin-top: 2%;
            display: inline-block;
        }
        fieldset{
            /*For Firefox:*/
            background: -moz-linear-gradient(rgba(255,254,163,0.76), rgba(215,65,136,0.76));
            /*For Safari:*/
            background: -webkit-linear-gradient(rgba(255,254,163,0.76), rgba(215,65,136,0.76));
            /*For Opera:*/
            background: -o-linear-gradient(rgba(255,254,163,0.76), rgba(215,65,136,0.76));
            /*Standard syntax:*/
            background: linear-gradient(rgba(255,254,163,0.76), rgba(215,65,136,0.76));
            width: 50%;
        }
        .container{
            width: 500px;
            clear: both;
        }
        .input{
            width: 100%;
            clear: both;
        }
    </style>
    <script type="text/javascript">
        function describe() {
            document.getElementById("name").innerHTML = "you";
        }
    </script>
</head>
<body>
<fieldset>
    <h2>Login</h2>
    <div class="container">
<form method="post">
	Username:
	<input class = "input" type="text" name="username" size="50" alt="you" id = "name" onmouseover="describe()">
    <br>
	Password:
	<input class = "input"type="password" name="password" size="50">
    <br>
	Confirm password:
	<input class = "input" type="password" name="confirmPassword" size="50">
	<input type="submit" id = "color" style = "background-color: red" name="submit" value="submit">
</form>
    </div>
	<?php
    $username = "";
    $password = "";
    $confirmPass = "";
    if(isset($_POST['submit'])){
        $username = $_POST['username'];
        $password = $_POST['password'];
        $confirmPass = $_POST['confirmPassword'];
	    if(($username == null) || ($password == null)){
		    echo "PLEASE VALIDATE YOURSELF!";
	    }
	    elseif($password !== $confirmPass){
	        echo "Please retype your password correctly!";
        }
        else{
	       echo "Greetings " . $username . "! Your encrypted password is: " . crypt($password, CRYPT_SALT_LENGTH);
        }
    }
	?>
</fieldset>
</body>
</html>