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HTML 

              
                <div class="iphone">
  <div class="border">
    <div class="responsive-html5-chat">
    </div>
  </div>
</div>

<!-- DEMO -->
<a href="http://www.adobewordpress.com/iphone-mesajlar-ekrani" target="_blank" class="article" style="display:none">Read Article</a>
!

CSS 

              
                form.chat *{
  transition:all .5s;
  box-sizing:border-box;
  -webkit-box-sizing:border-box;
  -moz-box-sizing:border-box;
}

form.chat {
  margin:0;
  cursor:default;
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  top:0;
  -webkit-touch-callout: none; /* iOS Safari */
  -webkit-user-select: none;   /* Chrome/Safari/Opera */
  -khtml-user-select: none;    /* Konqueror */
  -moz-user-select: none;      /* Firefox */
  -ms-user-select: none;       /* IE/Edge */
  user-select: none;   
}

form.chat span.spinner{
  -moz-animation: loading-bar 1s 1;
  -webkit-animation: loading-bar 1s 1;
  animation: loading-bar 1s 1;
  display: block;
  height: 2px;
  background-color: #00e34d;
  transition: width 0.2s;
  position:absolute;
  top:0; left:0; right:0;
  z-index:4
}

form.chat .messages{
  display:block;
  overflow-x: hidden;
  overflow-y: scroll;
  position:relative;
  height:90%;
  width:100%;
  padding:2% 3%;
  border-bottom:1px solid #ecf0f1;
}

form.chat ::-webkit-scrollbar {width: 3px; height:1px;transition:all .5s;z-index:10;}
form.chat ::-webkit-scrollbar-track {background-color: white;}
form.chat ::-webkit-scrollbar-thumb {
  background-color: #bec4c8; 
  border-radius:3px;
}

form.chat .message{
  display:block;
  width:98%;
  padding:0.5%;
}

form.chat .message p{
  margin:0;
}

form.chat .myMessage,
form.chat .fromThem {
  max-width: 50%;
  word-wrap: break-word;
  margin-bottom: 20px;
}

form.chat .message:hover .myMessage{
  -webkit-transform: translateX(-130px);
  transform: translateX(-130px);
}

form.chat .message:hover .fromThem{
  -webkit-transform: translateX(130px);
  transform: translateX(130px);
}

form.chat .message:hover date {
  opacity: 1;
}

form.chat .myMessage,.fromThem{
  position: relative;
  padding: 10px 20px;
  color: white;
  border-radius: 25px;
  clear: both;
  font: 400 15px 'Open Sans', sans-serif;
}

form.chat .myMessage {
  background: #00e34d;
  color:white;
  float:right;
  clear:both;
  border-bottom-right-radius: 20px 0px\9;
}

form.chat .myMessage:before {
  content: "";
  position: absolute;
  z-index: 1;
  bottom: -2px;
  right: -8px;
  height: 19px;
  border-right: 20px solid #00e34d;
  border-bottom-left-radius: 16px 14px;
  -webkit-transform: translate(0, -2px);
  transform: translate(0, -2px);
  border-bottom-left-radius: 15px 0px\9;
  transform: translate(-1px, -2px)\9;
}

form.chat .myMessage:after {
  content: "";
  position: absolute;
  z-index: 1;
  bottom: -2px;
  right: -42px;
  width: 12px;
  height: 20px;
  background: white;
  border-bottom-left-radius: 10px;
  -webkit-transform: translate(-30px, -2px);
  transform: translate(-30px, -2px);
}

form.chat .fromThem {
  background: #E5E5EA;
  color: black;
  float: left;
  clear:both;
  border-bottom-left-radius: 30px 0px\9;
}
form.chat .fromThem:before {
  content: "";
  position: absolute;
  z-index: 2;
  bottom: -2px;
  left: -7px;
  height: 19px;
  border-left: 20px solid #E5E5EA;
  border-bottom-right-radius: 16px 14px;
  -webkit-transform: translate(0, -2px);
  transform: translate(0, -2px);
  border-bottom-right-radius: 15px 0px\9;
  transform: translate(-1px, -2px)\9;
}

form.chat .fromThem:after {
  content: "";
  position: absolute;
  z-index: 3;
  bottom: -2px;
  left: 4px;
  width: 26px;
  height: 20px;
  background: white;
  border-bottom-right-radius: 10px;
  -webkit-transform: translate(-30px, -2px);
  transform: translate(-30px, -2px);
}

form.chat date {
  position:absolute;
  top: 10px;
  font-size:14px;
  white-space:nowrap;
  vertical-align:middle;
  color: #8b8b90;
  opacity: 0;
  z-index:4;
}

form.chat .myMessage date {
  left: 105%;
}

form.chat .fromThem date {
  right: 105%;
}

form.chat input{
  font: 400 13px 'Open Sans', sans-serif;
  border:0;
  padding:0 15px;
  height:10%;
  outline:0;
}

form.chat input[type='text']{
  width:73%;
  float:left;
}

form.chat input[type='submit']{
  width:23%;
  background:transparent;
  color:#00E34D;
  font-weight:700;
  text-align:right;
  float:right;
}

  form.chat .myMessage,form.chat .fromThem{
    font-size:12px;
  }
  
  form.chat .message:hover .myMessage{
    transform: translateY(18px);
    -webkit-transform: translateY(18px);
  }

  form.chat .message:hover .fromThem{
    transform: translateY(18px);
    -webkit-transform: translateY(18px);
  }
  
  form.chat .myMessage date,form.chat .fromThem date {
    top: -20px;
    left:auto;
    right:0;
    font-size:12px;
  }
  
  form.chat .myMessage,
  form.chat .fromThem {
    max-width: 90%;
  }
  
@-moz-keyframes loading-bar {
  0% {
    width: 0%;
  }
  90% {
    width: 90%;
  }
  100% {
    width: 100%;
  }
}

@-webkit-keyframes loading-bar {
  0% {
    width: 0%;
  }
  90% {
    width: 90%;
  }
  100% {
    width: 100%;
  }
}

@keyframes loading-bar {
  0% {
    width: 0%;
  }
  90% {
    width: 90%;
  }
  100% {
    width: 100%;
  }
}

/* DEMO */
.iphone{
  width:300px;
  height:609px;
  background-image:url('http://www.adobewordpress.com/tasarim/images/iphone6.png');
  background-size:100% 100%;
  margin:0 auto;
  position:relative;
}

.border{
	position:absolute;
	top:12.3%;right:7%;left:7%;bottom:12%;
	overflow:hidden;
}

a.article{
  position:fixed;
  bottom:15px;left:15px;
  display:table;
  text-decoration:none;
  color:white;
  background-color:#00e34d;
  padding: 10px 20px;
  border-radius: 25px;
  font: 400 15px 'Open Sans', sans-serif;
}
!

JS 

              
                /*

Name    : Responsive HTML5 Chat

Responsive HTML5 Chat helps you to create useful chatbox on your website easly. 
You can change skin and sizes. You can read the installation and support documentation 
before you begin. If you do not find the answer, do not hesitate to send a message to me.

Owner   : Vatanay Ozbeyli
Web     : www.vatanay.com
Support : hi@vatanay.com

*/

function responsiveChat(element) {
    $(element).html('<form class="chat"><span></span><div class="messages"></div><input type="text" placeholder="Your message"><input type="submit" value="Send"></form>');

    function showLatestMessage(element) {
      $('.responsive-html5-chat').find('.messages').scrollTop($('.responsive-html5-chat .messages')[0].scrollHeight);
    }
    showLatestMessage(element);

    $(element + ' input[type="text"]').keypress(function (event) {
        if (event.which == 13) {
            event.preventDefault();
            $(element + ' input[type="submit"]').click();
        }
    });
    $(element + ' input[type="submit"]').click(function (event) {
        event.preventDefault();
        var message = $(element + ' input[type="text"]').val();
        if ($(element + ' input[type="text"]').val()) {
            var d = new Date();
            var clock = d.getHours() + ":" + d.getMinutes() + ":" + d.getSeconds();
            var month = d.getMonth() + 1;
            var day = d.getDate();
            var currentDate =
                (("" + day).length < 2 ? "0" : "") +
                day +
                "." +
                (("" + month).length < 2 ? "0" : "") +
                month +
                "." +
                d.getFullYear() +
                "&nbsp;&nbsp;" +
                clock;
            $(element + ' div.messages').append(
                '<div class="message"><div class="myMessage"><p>' +
                message +
                "</p><date>" +
                currentDate +
                "</date></div></div>"
            );
            setTimeout(function () {
                $(element + ' > span').addClass("spinner");
            }, 100);
            setTimeout(function () {
                $(element + ' > span').removeClass("spinner");
            }, 2000);
        }
        $(element + ' input[type="text"]').val("");
        showLatestMessage(element);
    });
}

function responsiveChatPush(element, sender, origin, date, message) {
    var originClass;
    if (origin == 'me') {
        originClass = 'myMessage';
    } else {
        originClass = 'fromThem';
    }
    $(element + ' .messages').append('<div class="message"><div class="' + originClass + '"><p>' + message + '</p><date><b>' + sender + '</b> ' + date + '</date></div></div>');
}

/* Activating chatbox on element */
responsiveChat('.responsive-html5-chat');

/* Let's push some dummy data */
responsiveChatPush('.chat', 'Kate', 'me', '08.03.2017 14:30:7', 'It looks beautiful!');
responsiveChatPush('.chat', 'John Doe', 'you', '08.03.2016 14:31:22', 'It looks like the iPhone message box.');
responsiveChatPush('.chat', 'Kate', 'me', '08.03.2016 14:33:32', 'Yep, is this design responsive?');
responsiveChatPush('.chat', 'Kate', 'me', '08.03.2016 14:36:4', 'By the way when I hover on my message it shows date.');
responsiveChatPush('.chat', 'John Doe', 'you', '08.03.2016 14:37:12', 'Yes, this is completely responsive.');

/* DEMO */
if (parent == top) {
  $("a.article").show();
}
!
999px

Console