Untitled

<?php
   include("config.php");
   session_start();

   if($_SERVER["REQUEST_METHOD"] == "POST") {
      // username and password sent from form

      $myusername = mysqli_real_escape_string($db,$_POST['username']);
      $mypassword = mysqli_real_escape_string($db,$_POST['password']);

      $sql = "SELECT id FROM admin WHERE username = '$myusername' and passcode = '$mypassword'";
      $result = mysqli_query($db,$sql);
      $row = mysqli_fetch_array($result,MYSQLI_ASSOC);
      $active = $row['active'];

      $count = mysqli_num_rows($result);

      // If result matched $myusername and $mypassword, table row must be 1 row

      if($count == 1) {
         $_SESSION['variable']=("myusername");
         $_SESSION['login_user'] = $myusername;

         header("Location: welcome.php");
      }else {
         $error = "Andas a tentar entrar num site q nao te pertence!";
      }
   }
?>
<html>

   <head>
       <title>Knock Knock</title>
       <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
       <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>
       <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

      <style type = "text/css">
         body {
            font-family: Impact, Haettenschweiler, "Franklin Gothic Bold", "Arial Black", "sans-serif";
			text-shadow: rgb(0, 20, 255) 0px 0px 10px, rgb(0, 126, 255) 0px 0px 10px;
            font-size:14px;
			background-color: black;
			margin-top: 20%;
         }

         label {
            font-weight:bold;
            width:100px;
            font-size:14px;
         }

         .box {
            border:dodgerblue solid 1px;
			background-color: black;
         }
          body, html{
              overflow-y: hidden;
              overflow-x: hidden;
              color: ghostwhite;
          }
         #someid {
             position: absolute;
             width: 300px;
             height: 100px;
             z-index: 15;
             top: 50%;
             left: 50%;
             margin: -50px 0 0 -150px;
         }
      </style>
       <link rel="stylesheet" type="text/css" href="animations.css">


   </head>

   <body bgcolor = "black">
   <div class="row  ">
     <div class=" animated fadeIn " id="someid">
      <div align = "center">

               <form action = "" method = "post">
                  <label>Username  :</label><input autocomplete="off" type = "text" name = "username" class = "box"/><br /><br />
                  <label>Password  :</label><input autocomplete="off" type = "password" name = "password" class = "box" /><br/><br />
                 <input type = "submit" style="position: absolute; left: -9999px; value = " Submit "/><br />
               </form>

               <div style = "font-size:11px; color:black; background-color: black; margin-top:10px"><?php echo $error; ?></div>

            </div>

         </div>
      </div>
      </div>
   </div>

   </body>
</html>