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CSS

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HTML 

              
                <body>
  <div class="container">
    <div class="row">
      <nav class="menu">
        <ul class="items">
          <li class="item">
            <i class="fa fa-home" aria-hidden="true"></i>
          </li>
          <li class="item">
            <i class="fa fa-user" aria-hidden="true"></i>
          </li>
          <li class="item">
            <i class="fa fa-pencil" aria-hidden="true"></i>
          </li>
          <li class="item item-active">
            <i class="fa fa-commenting" aria-hidden="true"></i>
          </li>
          <li class="item">
            <i class="fa fa-file" aria-hidden="true"></i>
          </li>
          <li class="item">
            <i class="fa fa-cog" aria-hidden="true"></i>
          </li>
        </ul>
      </nav>

      <section class="discussions">
        <div class="discussion search">
          <div class="searchbar">
            <i class="fa fa-search" aria-hidden="true"></i>
            <input type="text" placeholder="Search..."></input>
          </div>
        </div>
        <div class="discussion message-active">
          <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1438761681033-6461ffad8d80?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80);">
            <div class="online"></div>
          </div>
          <div class="desc-contact">
            <p class="name">Megan Leib</p>
            <p class="message">9 pm at the bar if possible 😳</p>
          </div>
          <div class="timer">12 sec</div>
        </div>

        <div class="discussion">
          <div class="photo" style="background-image: url(https://i.pinimg.com/originals/a9/26/52/a926525d966c9479c18d3b4f8e64b434.jpg);">
            <div class="online"></div>
          </div>
          <div class="desc-contact">
            <p class="name">Dave Corlew</p>
            <p class="message">Let's meet for a coffee or something today ?</p>
          </div>
          <div class="timer">3 min</div>
        </div>

        <div class="discussion">
          <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1497551060073-4c5ab6435f12?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=667&q=80);">
          </div>
          <div class="desc-contact">
            <p class="name">Jerome Seiber</p>
            <p class="message">I've sent you the annual report</p>
          </div>
          <div class="timer">42 min</div>
        </div>

        <div class="discussion">
          <div class="photo" style="background-image: url(https://card.thomasdaubenton.com/img/photo.jpg);">
            <div class="online"></div>
          </div>
          <div class="desc-contact">
            <p class="name">Thomas Dbtn</p>
            <p class="message">See you tomorrow ! 🙂</p>
          </div>
          <div class="timer">2 hour</div>
        </div>

        <div class="discussion">
          <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1553514029-1318c9127859?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=700&q=80);">
          </div>
          <div class="desc-contact">
            <p class="name">Elsie Amador</p>
            <p class="message">What the f**k is going on ?</p>
          </div>
          <div class="timer">1 day</div>
        </div>

        <div class="discussion">
          <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1541747157478-3222166cf342?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=967&q=80);">
          </div>
          <div class="desc-contact">
            <p class="name">Billy Southard</p>
            <p class="message">Ahahah 😂</p>
          </div>
          <div class="timer">4 days</div>
        </div>

        <div class="discussion">
          <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1435348773030-a1d74f568bc2?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1050&q=80);">
            <div class="online"></div>
          </div>
          <div class="desc-contact">
            <p class="name">Paul Walker</p>
            <p class="message">You can't see me</p>
          </div>
          <div class="timer">1 week</div>
        </div>
      </section>
      <section class="chat">
        <div class="header-chat">
          <i class="icon fa fa-user-o" aria-hidden="true"></i>
          <p class="name">Megan Leib</p>
          <i class="icon clickable fa fa-ellipsis-h right" aria-hidden="true"></i>
        </div>
        <div class="messages-chat">
          <div class="message">
            <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1438761681033-6461ffad8d80?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80);">
              <div class="online"></div>
            </div>
            <p class="text"> Hi, how are you ? </p>
          </div>
          <div class="message text-only">
            <p class="text"> What are you doing tonight ? Want to go take a drink ?</p>
          </div>
          <p class="time"> 14h58</p>
          <div class="message text-only">
            <div class="response">
              <p class="text"> Hey Megan ! It's been a while 😃</p>
            </div>
          </div>
          <div class="message text-only">
            <div class="response">
              <p class="text"> When can we meet ?</p>
            </div>
          </div>
          <p class="response-time time"> 15h04</p>
          <div class="message">
            <div class="photo" style="background-image: url(https://images.unsplash.com/photo-1438761681033-6461ffad8d80?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80);">
              <div class="online"></div>
            </div>
            <p class="text"> 9 pm at the bar if possible 😳</p>
          </div>
          <p class="time"> 15h09</p>
        </div>
        <div class="footer-chat">
          <i class="icon fa fa-smile-o clickable" style="font-size:25pt;" aria-hidden="true"></i>
          <input type="text" class="write-message" placeholder="Type your message here"></input>
          <i class="icon send fa fa-paper-plane-o clickable" aria-hidden="true"></i>
        </div>
      </section>
    </div>
  </div>
</body>
!

CSS 

              
                body {
  padding: 5%;
  background-color: #F5F5F5;
}

.container {
  padding:0;
  background-color: #FFF; 
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
  height: 700px;
}

/* ===== MENU ===== */
.menu {
  float: left;
  height: 700px;;
  width: 70px;
  background: #4768b5;
  background: -webkit-linear-gradient(#4768b5, #35488e);
  background: -o-linear-gradient(#4768b5, #35488e);
  background: -moz-linear-gradient(#4768b5, #35488e);
  background: linear-gradient(#4768b5, #35488e);
  box-shadow: 0 10px 20px rgba(0,0,0,0.19);
}

.menu .items {
  list-style:none;
  margin: auto;
  padding: 0;
}

.menu .items .item {
  height: 70px;
  border-bottom: 1px solid #6780cc;
  display:flex;
  justify-content: center;
  align-items: center;
  color: #9fb5ef;
  font-size: 17pt;
}

.menu .items .item-active {
  background-color:#5172c3;
  color: #FFF;
}

.menu .items .item:hover {
  cursor: pointer;
  background-color: #4f6ebd;
  color: #cfe5ff;
}

/* === CONVERSATIONS === */

.discussions {
  width: 35%;
  height: 700px;
  box-shadow: 0px 8px 10px rgba(0,0,0,0.20);
  overflow: hidden;
  background-color: #87a3ec;
  display: inline-block;
}

.discussions .discussion {
  width: 100%;
  height: 90px;
  background-color: #FAFAFA;
  border-bottom: solid 1px #E0E0E0;
  display:flex;
  align-items: center;
  cursor: pointer;
}

.discussions .search {
  display:flex;
  align-items: center;
  justify-content: center;
  color: #E0E0E0;
}

.discussions .search .searchbar {
  height: 40px;
  background-color: #FFF;
  width: 70%;
  padding: 0 20px;
  border-radius: 50px;
  border: 1px solid #EEEEEE;
  display:flex;
  align-items: center;
  cursor: pointer;
}

.discussions .search .searchbar input {
  margin-left: 15px;
  height:38px;
  width:100%;
  border:none;
  font-family: 'Montserrat', sans-serif;;
}

.discussions .search .searchbar *::-webkit-input-placeholder {
    color: #E0E0E0;
}
.discussions .search .searchbar input *:-moz-placeholder {
    color: #E0E0E0;
}
.discussions .search .searchbar input *::-moz-placeholder {
    color: #E0E0E0;
}
.discussions .search .searchbar input *:-ms-input-placeholder {
    color: #E0E0E0;
}

.discussions .message-active {
  width: 98.5%;
  height: 90px;
  background-color: #FFF;
  border-bottom: solid 1px #E0E0E0;
}

.discussions .discussion .photo {
    margin-left:20px;
    display: block;
    width: 45px;
    height: 45px;
    background: #E6E7ED;
    -moz-border-radius: 50px;
    -webkit-border-radius: 50px;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}

.online {
  position: relative;
  top: 30px;
  left: 35px;
  width: 13px;
  height: 13px;
  background-color: #8BC34A;
  border-radius: 13px;
  border: 3px solid #FAFAFA;
}

.desc-contact {
  height: 43px;
  width:50%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.discussions .discussion .name {
  margin: 0 0 0 20px;
  font-family:'Montserrat', sans-serif;
  font-size: 11pt;
  color:#515151;
}

.discussions .discussion .message {
  margin: 6px 0 0 20px;
  font-family:'Montserrat', sans-serif;
  font-size: 9pt;
  color:#515151;
}

.timer {
  margin-left: 15%;
  font-family:'Open Sans', sans-serif;
  font-size: 11px;
  padding: 3px 8px;
  color: #BBB;
  background-color: #FFF;
  border: 1px solid #E5E5E5;
  border-radius: 15px;
}

.chat {
  width: calc(65% - 85px);
}

.header-chat {
  background-color: #FFF;
  height: 90px;
  box-shadow: 0px 3px 2px rgba(0,0,0,0.100);
  display:flex;
  align-items: center;
}

.chat .header-chat .icon {
  margin-left: 30px;
  color:#515151;
  font-size: 14pt;
}

.chat .header-chat .name {
  margin: 0 0 0 20px;
  text-transform: uppercase;
  font-family:'Montserrat', sans-serif;
  font-size: 13pt;
  color:#515151;
}

.chat .header-chat .right {
  position: absolute;
  right: 40px;
}

.chat .messages-chat {
  padding: 25px 35px;
}

.chat .messages-chat .message {
  display:flex;
  align-items: center;
  margin-bottom: 8px;
}

.chat .messages-chat .message .photo {
    display: block;
    width: 45px;
    height: 45px;
    background: #E6E7ED;
    -moz-border-radius: 50px;
    -webkit-border-radius: 50px;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
}

.chat .messages-chat .text {
  margin: 0 35px;
  background-color: #f6f6f6;
  padding: 15px;
  border-radius: 12px;
}

.text-only {
  margin-left: 45px;
}

.time {
  font-size: 10px;
  color:lightgrey;
  margin-bottom:10px;
  margin-left: 85px;
}

.response-time {
  float: right;
  margin-right: 40px !important;
}

.response {
  float: right;
  margin-right: 0px !important;
  margin-left:auto; /* flexbox alignment rule */
}

.response .text {
  background-color: #e3effd !important;
}

.footer-chat {
  width: calc(65% - 66px);
  height: 80px;
  display:flex;
  align-items: center;
  position:absolute;
  bottom: 0;
  background-color: transparent;
  border-top: 2px solid #EEE;
  
}

.chat .footer-chat .icon {
  margin-left: 30px;
  color:#C0C0C0;
  font-size: 14pt;
}

.chat .footer-chat .send {
  color:#fff;
  background-color: #4f6ebd;
  position: absolute;
  right: 50px;
  padding: 12px 12px 12px 12px;
  border-radius: 50px;
  font-size: 14pt;
}

.chat .footer-chat .name {
  margin: 0 0 0 20px;
  text-transform: uppercase;
  font-family:'Montserrat', sans-serif;
  font-size: 13pt;
  color:#515151;
}

.chat .footer-chat .right {
  position: absolute;
  right: 40px;
}

.write-message {
  border:none !important;
  width:60%;
  height: 50px;
  margin-left: 20px;
  padding: 10px;
}

.footer-chat *::-webkit-input-placeholder {
  color: #C0C0C0;
  font-size: 13pt;
}
.footer-chat input *:-moz-placeholder {
  color: #C0C0C0;
  font-size: 13pt;
}
.footer-chat input *::-moz-placeholder {
  color: #C0C0C0;
  font-size: 13pt;
  margin-left:5px;
}
.footer-chat input *:-ms-input-placeholder {
  color: #C0C0C0;
  font-size: 13pt;
}

.clickable {
  cursor: pointer;
}
!

JS
!
999px

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