Hà Minh Triết --- ! Please enter your key to unlock the website (Bạn hãy nhập key để mở khóa trang website) -->
<style type='text/css'>
                .inpute {
                    width: 500px;
                    height: 20px;
                    border-color: #EA2A14;
                    background-color: transparent;
                    color: lime;
                    text-align: center;
                }

                .submite {
                    width: 200px;
                    border-color: lime;
                    background-color: transparent;
                    color: lime;
                }
            </style>

<form action="" method="post" style=" text-align: center;">
                <input type="text" name="key" class="inpute" placeholder="Enter Key" autocomplete="on"><br><br>
                <br>
                <input type="submit" name="submit" class="submite" value="Unlock the website" />
 </form>
 
 <!-- -->
 
 <!-- Optional! add this in the bottom of your script . 
 after post method, if you refresh the page so it will not loop the encrypt function that cause data corrupt! ---->
   <script>
    if ( window.history.replaceState ) {
        window.history.replaceState( null, null, window.location.href );
    }
</script>