<form action="#" method="post" >
            <div class="user_login">
            <center>
                <input type="text" id="id" placeholder="User ID" name="name">
            </center>
            <br>
            <center>
                <input type="text" id="password" placeholder="Password" name="pass">
            </center>
            <br>
            <center>
                <input type= "submit" value ="login" name="submit">
            </center>
            </div>
    </form>

 <?php
    $servername = "localhost";
    $username = "root";
    $password = "";
    $db = "wms";
    $con = new mysqli($servername, $username, $password, $db);


if(isset($_POST['submit'])){
    $select = "select from user WHERE user_name='".$_POST['name']."' AND password='".$_POST['pass']."'";
    $query= mysqli_query($con,$select);
    if($con || mysqli_num_rows($query) == 1){echo "<br><center> login successfully</center>";}
    else{echo "<br><center>login fail</center>";}
}
?>