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HTML

              
                <div class="container">
  <div class="side-nav">
    <div class="profile">
      <img src="https://placekitten.com/350/350?image=10" alt="">
    </div>
    <div class="icon-container">
      <i class="fa fa-home"></i>
    </div>
    <div class="icon-container">
      <i class="fas fa-calendar"></i>
    </div>
    <div class="icon-container active">
      <i class="fa fa-comment-alt"></i>
    </div>
    <div class="icon-container">
      <i class="fa fa-list"></i>
    </div>
    <div class="icon-container">
      <i class="fa fa-sticky-note"></i>
    </div>
  </div>
  <div class="main-veiw">
    <div class="top-nav">
      <div class="logo">&lt CHAT APP /&gt</div>
    </div>
    <div class="content">
      <div class="message-list">
        <div class="list-top">
          <input type="text">
          <button class="search">
            <i class="fa fa-search"></i>
          </button>
          <button class="add">
            +
          </button>
          <button class="close-list">
            <i class="fa fa-chevron-left"></i>
          </button>
        </div>
        <div class="list">
          <div class="contact unread">
            <div class="icon">
              <img src="https://placekitten.com/200/200" alt="kitten-image">
            </div>
            <div class="blurb">
              <h2 class="name">
                Steve Wiggins
              </h2>
            </div>
          </div>
          <div class="contact unread active">
            <div class="icon">
              <img src="https://placekitten.com/200/200?image=2" alt="kitten-image">
            </div>
            <div class="blurb">
              <h2 class="name">
                Invasion Force
              </h2>
            </div>
          </div>
          <div class="contact">
            <div class="icon">
              <img src="https://placekitten.com/550/555" alt="kitten-image">
            </div>
            <div class="blurb">
              <h2 class="name">
                John Doe
              </h2>
            </div>
          </div>
          <div class="contact">
            <div class="icon">
              <img src="https://placekitten.com/700/700?image=16" alt="kitten-image">
            </div>
            <div class="blurb">
              <h2 class="name">
                Maria Hugges
              </h2>
            </div>
          </div>
          <div class="contact">
            <div class="icon">
              <img src="https://placedog.net/400/400" alt="puppy-image">
            </div>
            <div class="blurb">
              <h2 class="name">
                Commander Dave
              </h2>
            </div>
          </div>
        </div>
      </div>
      <div class="chat">
        <div class="top">
          <div class="open-message">
            <i class="fa fa-chevron-left"></i>
          </div>
          <div class="name" id="open">
            Invasion Force
          </div>
          <div class="button-container">
            <button>
              <i class="fa fa-phone"></i>
            </button>
            <button>
              <i class="fa fa-camera"></i>
            </button>
            <button>
              <i class="fa fa-folder"></i>
            </button>
          </div>
        </div>
        <div class="message-container">
          <div class="comment me">
            <img src="https://placekitten.com/300/300?image=10" alt="">
            <div class="bubble">
              <img src="https://dummyimage.com/400x400/ddd/fff" alt="">
            </div>
          </div>
          <div class="comment me">
            <img src="https://placekitten.com/300/300?image=10" alt="">
            <div class="bubble">
              Let me know if this works
            </div>
          </div>
          <div class="comment other">
            <img src="https://placekitten.com/700/700?image=16" alt="">
            <div class="bubble">
              yes this is great
            </div>
          </div>
          <div class="divider"><span>
              Feb 8 12:01
            </span></div>
          <div class="comment other">
            <img src="https://placekitten.com/700/700?image=12" alt="">
            <div class="bubble">
              Did you find a place for monday's metting?
            </div>
          </div>
          <div class="comment me">
            <img src="https://placekitten.com/300/300?image=10" alt="">
            <div class="bubble">
              I found a couple venues. The one on meeting street seems nice.
            </div>
          </div>
          <div class="comment me">
            <img src="https://placekitten.com/300/300?image=10" alt="">
            <div class="bubble">
              can you give me some guidelines to follow as I look for one?
            </div>
          </div>
          <div class="comment other">
            <img src="https://placekitten.com/1000/1000?image=12" alt="">
            <div class="bubble">
              Here's a link to a good one. It should be avalible.
              <a href="#">venues.com</a>
            </div>
          </div>
          <div class="divider">
            <span>Today 8:58 PM</span>
          </div>
          <div class="comment me">
            <img src="https://placekitten.com/300/300?image=10" alt="">
            <div class="bubble">
              Are we still holding the metting on monday?
            </div>
          </div>
          <div class="comment other">
            <img src="https://placekitten.com/1000/1000?image=12" alt="">
            <div class="bubble">
              Yeah, can you bring napkins?
            </div>
          </div>
          <div class="comment other">
            <img src="https://placekitten.com/700/700?image=16" alt="">
            <div class="bubble">
              I've got napkins covered 👍
            </div>
          </div>
          <div class="comment me">
            <img src="https://placekitten.com/300/300?image=10" alt="">
            <div class="bubble">
              How do you feel about terraforming?
            </div>
          </div>
          <div class="comment other">
            <img src="https://placekitten.com/1000/1000?image=12" alt="">
            <div class="bubble">
              I feel like thats's a bit off topic. 
            </div>
          </div>
        </div>
        <div class="input-container">
          <button class="attach">
            <i class="fa fa-paperclip"></i>
          </button>
          <div class="textarea-container">
            <textarea type="text" placeholder="message"></textarea>
          </div>
          <button class="send">
            <i class="fa fa-paper-plane"></i>
          </button>
        </div>
      </div>
      <div class="contact-detail">
        <button class="close">
          x
        </button>
        <img src="https://placekitten.com/200/200?image=2" alt="">
        <h3>Invasion Force</h3>
        <div class="bio">
          A bunch of great weirdos
        </div>
        <ul class="contact-list">
          <li>
            <img class="contact-img" src="https://placekitten.com/700/700?image=16" alt="">
            <span class="name">
              Maria Hugges
            </span>
          </li>
          <li>
            <img class="contact-img" src="https://placekitten.com/1000/1000?image=12" alt="">
            <span class="name">
              Lucy Farrel
            </span>
          </li>
          <li>
            <img class="contact-img" src="https://placekitten.com/540/540" alt="">
            <span class="name">
              Your Neighbor
            </span>
          </li>
          <li>
            <img class="contact-img" src="https://placedog.net/300/300" alt="">
            <span class="name">
              Sam Willis
            </span>
          </li>
        </ul>
      </div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=Roboto&display=swap");

:root {
  --grey-1: #2a2a2b;
  --grey-2: #494848;
  --grey-3: #131312;
  --grey-4: #333334;
  --grey-5: #bbb;
  --color-1: #64af50; /*#1F09AC*/
  --font-1: "Roboto", sans-serif;
}

body {
  margin: 0px;
  overflow: hidden;
}

.container {
  display: grid;
  grid-template-columns: 80px auto;
  grid-template-rows: 100vh;
}

/*======= Side Nav ==========*/

.side-nav {
  background: var(--grey-3);
  color: white;
  font-size: 25px;
  text-align: center;
  height: 100%;
  z-index: 2;
}

.side-nav .profile img {
  margin-top: 15px;
  width: auto;
  height: 60px;
  filter: grayscale(1);
  border-radius: 50%;
}

.icon-container {
  line-height: 60px;
  height: 60px;
}

.icon-container:hover {
  background: var(--grey-2);
}

.icon-container + .active {
  border-left: 8px solid var(--color-1);
}

.top-nav {
  border-bottom: 1px solid grey;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.top-nav .logo {
  text-align: center;
  font-size: 150%;
  font-weight: bold;
  font-family: "Roboto", sans-serif;
  color: var(--color-1);
}

.main-veiw {
  display: grid;
  grid-template-columns: auto;
  grid-template-rows: 8vh 92vh;
}

.content {
  display: grid;
  grid-template-columns: 40% auto;
  grid-template-rows: 100%;
}

@media screen and (min-width: 800px) {
  .content {
    grid-template-columns: 30% auto;
  }
}

@media screen and (max-width: 640px) {
  .content {
    grid-template-columns: auto;
  }
}

/*=========Message List======*/

.message-list {
  background: var(--grey-2);
  height: 100%;
}

@media screen and (max-width: 640px) {
  .message-list {
    position: absolute;
    display: none;
    z-index: 1;
  }
}

.message-list .list-top {
  display: grid;
  grid-template-columns: 60% 22% 18%;
  padding: 5px;
}

.message-list .list-top .close-list {
  display: none;
}

@media screen and (max-width: 640px) {
  .message-list .list-top {
    grid-template-columns: 60% 20% 10% 10%;
  }
  .message-list .list-top .close-list {
    display: block;
    position: absolute;
    background: transparent;
    border: none;
    content: "\2039";
    font-size: 20px;
    font-family: var(--font-1);
    color: white;
    top: 15px;
    right: 15px;
  }
}

.message-list input {
  display: inline;
  font-size: 20px;
  padding: 10px 10px;
  border-radius: 30px 0px 0px 30px;
  outline: none;
  border: none;
  background: var(--grey-1);
  color: white;
}

.message-list .search {
  display: inline;
  border: none;
  border-radius: 0px 30px 30px 0px;
  background: var(--grey-1);
  color: white;
  outline: none;
}

.message-list .add {
  border: none;
  background: transparent;
  font-size: 30px;
  color: white;
  outline: none;
}

.message-list .contact {
  display: grid;
  grid-template-columns: 25% auto;
  height: 50px;
  padding: 10px;
  background: var(--grey-1);
  color: white;
  font-family: var(--font-1);
  position: relative;
}

@media screen and (max-width: 640px) {
  .message-list .contact {
    display: grid;
    grid-template-columns: 60px auto;
  }
}

.message-list .active {
  background: var(--grey-4);
}

.message-list .unread:before {
  content: "";
  display: block;
  position: absolute;
  top: 11px;
  left: 11px;
  height: 12px;
  width: 12px;
  border-radius: 50%;
  background: var(--color-1);
  z-index: 1;
}

.message-list .name {
  margin: 5px 10px;
  font-size: 16px;
  font-weight: 100;
}

.message-list img {
  height: 100%;
  width: auto;
  max-height: 50px;
  border-radius: 50%;
  filter: grayscale(1);
  z-index: 2;
}

/*======== Chat Part ===========*/

.chat {
  display: grid;
  grid-template-rows: 8vh 72vh 20vh;
  overflow: hidden;
  height: 100%;
  width: 100%;
}

/*========= Top Nav ============*/

.chat .top {
  font-family: "Roboto", sans-serif;
  width: 100%;
  display: flex;
  align-items: center;
}

.chat .top .open-message {
  padding: 0 10px;
  color: var(--grey-3);
  display: none;
}

@media screen and (max-width: 640px) {
  .chat .top .open-message {
    display: block;
  }
}

.chat .top .open-message:hover {
  color: var(--color-1);
  transition: color ease 0.5s;
}

.chat .top .name {
  font-size: 20px;
  font-weight: 600;
  color: grey;
  margin-left: 10px;
  width: 200px;
  cursor: pointer;
}

.chat .top .name:hover {
  color: var(--color-1);
  transition: color ease 0.5s;
}

.chat .button-container {
  text-align: right;
  width: 75%;
}

.chat .button-container button {
  border: none;
  background: white;
  font-size: 20px;
  color: var(--grey-2);
}

.chat .button-container button:hover {
  color: var(--color-1);
  transition: color ease 0.5s;
}

/*======== Chat Message Container =====*/

.chat .message-container {
  padding: 5px;
  overflow-y: scroll;
  width: 100%;
  height: 96%;
  padding-right: 18px;
  box-sizing: content-box;
}

.chat .divider {
  width: 100%;
  height: 30px;
  line-height: 30px;
  color: var(--grey-5);
  font-family: var(--font-1);
  text-align: center;
  position: relative;
  display: inline-block;
}

.chat .divider span {
  background: white;
  padding: 0px 10px;
}

.chat .divider:before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  height: 1px;
  width: 100%;
  background: var(--grey-5);
  z-index: -1;
}

.chat .comment {
  min-height: 50px;
  width: 100%;
  float: left;
  margin: 5px 0px;
  text-align: left;
}

.chat .me {
  float: right;
  text-align: right;
}

.chat .comment img {
  filter: grayscale(1);
  height: 50px;
  width: auto;
  border-radius: 50%;
  float: left;
}

.chat .me img {
  float: right;
}

.chat .bubble {
  display: inline-block;
  background: var(--color-1);
  padding: 8px 12px;
  border-radius: 8px;
  color: white;
  font-family: var(--font-1);
  max-width: 55%;
  position: relative;
  margin: 0px 15px;
}

.chat .me .bubble {
  background: var(--grey-5);
  text-align: left;
}

.chat .other .bubble:before {
  content: "";
  top: 0px;
  left: -25px;
  position: absolute;
  background: transparent;
  height: 0px;
  width: 0px;
  border-left: 15px solid transparent;
  border-bottom: 15px solid transparent;
  border-right: 20px solid var(--color-1);
}

.chat .me .bubble:after {
  content: "";
  position: absolute;
  top: 0px;
  right: -25px;
  background: transparent;
  height: 0px;
  width: 0px;
  border-right: 15px solid transparent;
  border-bottom: 15px solid transparent;
  border-left: 20px solid var(--grey-5);
}

.chat .bubble img {
  border-radius: 5px;
  height: 200px;
  width: auto;
  filter: none;
}

.chat .bubble a {
  color: white;
}

/*======== Typing part =========*/

.chat .input-container {
  display: grid;
  grid-template-columns: 8vh auto 8vh;
  padding: 10px 6px;
  border-top: 1px solid #ccc;
}

.chat .attach {
  border: none;
  border-radius: 50%;
  width: 100%;
  height: 8vh;
  max-height: 60px;
  max-width: 60px;
}

.chat .textarea-container {
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.chat textarea {
  border: none;
  outline: none;
  font-size: 16px;
  font-family: "Roboto", sans-serif;
  resize: none;
  overflow-y: scroll;
  width: 100%;
  height: 8vh;
  padding-right: 18px;
  box-sizing: content-box;
  margin-left: 10px;
}

.chat .send {
  border: none;
  background: var(--color-1);
  color: white;
  font-size: 20px;
  height: 8vh;
  width: 8vh;
  border-radius: 50%;
  max-height: 60px;
  max-width: 60px;
}
/*======= Contact List =======*/

.contact-detail {
  position: absolute;
  right: 0;
  top: 0;
  width: 300px;
  height: 100%;
  background: #eee;
  display: none;
  font-family: "Roboto", sans-serif;
  padding: 0px 10px;
  overflow-y: scroll;
}

.close {
  font-size: 20px;
  border: none;
  background: transparent;
}

.contact-detail img {
  width: 70%;
  height: auto;
  display: block;
  margin: 0 auto;
  filter: grayscale(0);
  border-radius: 50%;
}

.contact-detail h3 {
  color: var(--grey-2);
  text-align: center;
  margin: 8px 0px;
  font-size: 22px;
}

.contact-detail .bio {
  text-align: center;
}

.contact-detail ul {
  margin: 0px;
  margin-top: 10px;
  padding: 0px;
}

.contact-detail ul li {
  list-style: none;
  width: 100%;
  background: white;
  height: 55px;
  display: flex;
  align-items: center;
  padding: 10px 0px;
  border-radius: 8px;
  margin-bottom: 5px;
}

.contact-detail ul li .contact-img {
  border-radius: none;
  height: auto;
  width: 55px;
  margin: 0 10px;
  display: inline-block;
  filter: grayscale(1);
}

.contact-list ul li .name {
  display: inline-block;
}

              
            
!

JS

              
                var element = document.querySelector(".message-container");
element.scrollTop = element.scrollHeight;

let open = document.querySelector("#open");
let close = document.querySelector(".close");
let panel = document.querySelector(".contact-detail");

open.onclick = function () {
  gsap.set(panel, {
    display: "block",
    x: 300
  });
  gsap.to(panel, 0.5, { x: 0 });
};

close.onclick = function () {
  gsap.to(panel, 0.5, { x: 320 });
};

let openList = document.querySelector(".open-message");
let closeList = document.querySelector(".close-list");
let list = document.querySelector(".message-list");

openList.onclick = function () {
  gsap.set(list, { display: "block", x: -300 });
  gsap.to(list, 0.5, { x: 0});
};

closeList.onclick = function () {
  gsap.to(list, 0.5, {x: -400});
  gsap.to(list, 0, {display: "none", delay: 1});
}
              
            
!
999px

Console