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HTML 

              
                <div class="menu">
            <a href="#" class="back"><i class="fa fa-angle-left"></i> <img src="https://i.imgur.com/G4EjwqQ.jpg" draggable="false"/></a>
            <div class="name">Random chat</div>
	<div class="members"><b>You</b>, Marga, Charo & Brotons</div>
        </div>
    <ol class="chat">
    <li class="other">
      <div class="msg">
          <div class="user">Marga<span class="range admin">Admin</span></div>
        <p>Dude</p>
        <p>Want to go dinner? <emoji class="pizza"></emoji></p>
        <time>20:17</time>
      </div>
    </li>
    <li class="self">
      <div class="msg">
        <p>Puff...</p>
        <p>I'm still doing the Góngora comment... <emoji class="books"></emoji></p>
        <p>Better other day</p>
        <time>20:18</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Brotons</div>
        <p>What comment about Góngora? <emoji class="suffocated"></emoji></p>
        <time>20:18</time>
      </div>
    </li>
    <li class="self">
      <div class="msg">
        <p>The comment sent Marialu</p>
        <p>It's for tomorrow</p>
        <time>20:18</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Brotons</div>
        <p><emoji class="scream"></emoji></p>
        <p>Hand it to me! <emoji class="please"></emoji></p>
        <time>20:18</time>
      </div>
    </li>
    <li class="self">
      <div class="msg">
        <img src="https://i.imgur.com/kUPxcsI.jpg" draggable="false"/>
        <time>20:19</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Brotons</div>
        <p>Thank you! <emoji class="hearth_blue"></emoji></p>
        <time>20:20</time>
      </div>
    </li>
        <div class="day">Today</div>
    <li class="self">
      <div class="msg">
        <p>Who wants to play Minecraft?</p>
        <time>18:03</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Charo</div>
        <p>Come on, I didn't play it for four months</p>
        <time>18:07</time>
      </div>
    </li>
    <li class="self">
      <div class="msg">
        <p>Ehh, the launcher crash... <emoji class="cryalot"></emoji></p>
        <time>18:08</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Charo</div>
        <p><emoji class="lmao"></emoji></p>
        <p>Sure that is the base code</p>
        <p>I told it to Mojang</p>
        <time>18:08</time>
      </div>
    </li>
    <li class="self">
      <div class="msg">
        <p>It's a joke</p>
        <p>Moai attack!</p>
        <p><emoji class="moai"></emoji><emoji class="moai"></emoji><emoji class="moai"></emoji><emoji class="moai"></emoji><emoji class="moai"></emoji><emoji class="moai"></emoji></p>
        <time>18:10</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Charo</div>
        <p>XD</p>
        <p><emoji class="funny"></emoji></p>
        <p>Heart for this awesome design!</p>
        <time>18:08</time>
      </div>
    </li>
        <p class="notification">David joined the group <time>18:09</time></p>
    <li class="self">
      <div class="msg">
        <p>Heeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeellooooooooooooooooooooooooooooooo David <emoji class="smile"/></p>
        <time>18:09</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">David</div>
          <p>What is that <emoji class="shit"></emoji> ?</p>
        <time>18:10</time>
      </div>
    </li>
        <p class="notification">David left the group <time>18:11</time></p>
    <li class="other">
      <div class="msg">
          <div class="user">Brotons</div>
        <p>Lol?</p>
        <time>18:12</time>
      </div>
    </li>
    <li class="other">
      <div class="msg">
          <div class="user">Marga<span class="range admin">Admin</span></div>
        <p>I'm boring...</p>
        <p>Who wants to do some logarithms? <emoji class="smile"></emoji></p>
        <time>18:15</time>
      </div>
    </li>
    </ol>
<div class="typezone">
<form><textarea type="text" placeholder="Say something"></textarea><input type="submit" class="send" value=""/></form>
<div class="emojis"></div></div>
!

CSS 

              
                html, body {
    background: #252C33;
    font-family: 'Lato', sans-serif;
    margin: 0px auto;
}
::selection{
  background: rgba(82,179,217,0.3);
  color: inherit;
}

/* M E N U */

.menu {
    position: fixed;
    top: 0px;
    left: 0px;
    right: 0px;
    width: 100%;
    height: 50px;
    background: rgba(27,35,42,0.9);
    z-index: 100;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.back {
    position: absolute;
    width: 90px;
    height: 50px;
    top: 0px;
    left: 0px;
    color: rgba(255,255,255,0.5);
    line-height: 45px;
    font-size: 40px;
    padding-left: 10px;
    cursor: pointer;
    transition: .15s all;
}
.back img {
    position: absolute;
    top: 5px;
    left: 30px;
    width: 40px;
    height: 40px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 100%;
    -webkit-border-radius: 100%;
    -moz-border-radius: 100%;
    -ms-border-radius: 100%;
    margin-left: 15px;
    }
.back:active {
    background: rgba(0,0,0,0.15);
}
.name {
    position: absolute;
    top: 3px;
    left: 110px;
    font-family: 'Lato';
    font-size: 25px;
    font-weight: 300;
    color: rgba(255,255,255,0.98);
    cursor: default;
}
.last {
    position: absolute;
    top: 30px;
    left: 115px;
    font-family: 'Lato';
    font-size: 11px;
    font-weight: 400;
    color: rgba(255,255,255,0.6);
    cursor: default;
}
.members {
    position: absolute;
    top: 30px;
    left: 115px;
    font-family: 'Lato';
    font-size: 11px;
    font-weight: 400;
    color: rgba(255,255,255,0.6);
    cursor: default;
    word-spacing: 2px;
}

/* M E S S A G E S */

.chat {
    list-style: none;
    background: none;
    margin: 0;
    padding: 0 0 50px 0;
    margin-top: 60px;
    margin-bottom: 15px;
}
.chat li {
    padding: 0.5rem;
    overflow: hidden;
    display: flex;
}
.chat .day {
    position: relative;
    display: block;
    text-align: center;
    color: rgba(255,255,255,0.3);
    height: 20px;
    text-shadow: 7px 0px 0px #252C33, 6px 0px 0px #252C33, 5px 0px 0px #252C33, 4px 0px 0px #252C33, 3px 0px 0px #252C33, 2px 0px 0px #252C33, 1px 0px 0px #252C33, 1px 0px 0px #252C33, 0px 0px 0px #252C33, -1px 0px 0px #252C33, -2px 0px 0px #252C33, -3px 0px 0px #252C33, -4px 0px 0px #252C33, -5px 0px 0px #252C33, -6px 0px 0px #252C33, -7px 0px 0px #252C33;
    box-shadow: inset 20px 0px 0px #252C33, inset -20px 0px 0px #252C33, inset 0px -2px 0px rgba(255,255,255,0.1);
    line-height: 38px;
    margin-top: 5px;
    margin-bottom: 20px;
    cursor: default;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
.chat .notification {
    position: relative;
    display: inherit;
    text-align: center;
    font-size: 13px;
    color: rgba(255,255,255,0.15);
    background: rgba(234, 247, 255, 0.035);
    line-height: 30px;
    border-radius: 100px;
    margin: 7px 35%;
    height: 30px;
    width: 30%;
    box-shadow: 0px 1px 0px rgba(0,0,0,.05), 0px -1px 0px rgba(0,0,0,.05), inset 0px 1px 0px rgba(255,255,255,.02), inset 0px -1px 0px rgba(255,255,255,.02);
    text-shadow: 0px -1px 0px rgba(0,0,0,.1), 0px 1px 0px rgba(255,255,255,.05);
    cursor: default;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    transition: all .2s cubic-bezier(0.565, -0.260, 0.255, 1.410);
}
.chat .notification time {
    position: absolute;
    top: 7px;
    right: 7px;
    font-size: 11px;
    padding: 8px;
    border-radius: 100px;
    background: #252C33;
    box-shadow: 0px 0px 2px rgba(255,255,255,.02), inset 0px 0px 1px rgba(27,35,42,0.1);
    height: 1px;
    line-height: 0px;
    color: rgba(255,255,255,0.1);
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    transition: all .2s cubic-bezier(0.565, -0.260, 0.255, 1.410);
}

.other .msg {
    border-top-left-radius: 0px;
    box-shadow: -1px 2px 0px #c1cbcd;
}
.other:before {
    content: "";
    position: relative;
    top: 0px;
    right: 0px;
    left: 0px;
    width: 0px;
    height: 0px;
    border: 5px solid #eef8ff;
    border-left-color: transparent;
    border-bottom-color: transparent;
}

.self {
    justify-content: flex-end;
    align-items: flex-end;
}
.self .msg {
    border-bottom-right-radius: 0px;
    box-shadow: 1px 2px 0px #c1cbcd;
}
.self:after {
    content: "";
    position: relative;
    display: inline-block;
    float: right;
    bottom: 0px;
    right: 0px;
    width: 0px;
    height: 0px;
    border: 5px solid #eef8ff;
    border-right-color: transparent;
    border-top-color: transparent;
    box-shadow: 0px 2px 0px #c1cbcd;
}

.msg {
    background: #eef8ff;
    min-width: 50px;
    padding: 10px;
    border-radius: 2px;
    word-break: break-all;
}
.msg .user {
    font-size: 14px;
    margin: 0 0 2px 0;
    color: #666;
    font-weight: 700;
    margin-top: -2px;
    margin-bottom: 5px;
    transition: all .2s ease;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
.msg .user .range.admin {
    display: inline-block;
    font-size: 10px;
    font-weight: 300;
    color: #6aea96;
    padding: 2px;
    border-radius: 3px;
    border: solid 1px #6aea96;
    background: rgba(255,255,255,0);
    margin-left: 5px;
}
.msg p {
    font-size: 13px;
    margin: 0 0 2px 0;
    color: #777;
    transition: all .2s ease;
}
.msg img {
    position: relative;
    display: block;
    width: 600px;
    border-radius: 5px;
    box-shadow: 0px 0px 3px #eee;
    transition: all .8s cubic-bezier(0.565, -0.260, 0.255, 1.410);
    cursor: default;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.msg time {
    font-size: 0.7rem;
    color: rgba(0,0,0,.35);
    margin-top: 3px;
    float: right;
    cursor: default;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
.msg time:before{
    content:"\f017";
    color: #ddd;
    font-family: FontAwesome;
    display: inline-block;
    margin-right: 4px;
}

emoji{
    display: inline-block;
    height: 18px;
    width: 18px;
    background-size: cover;
    background-repeat: no-repeat;
    margin-top: -7px;
    margin-left: 2px;
    margin-right: 2px;
    transform: translate3d(0px, 4px, 0px);
}
emoji.please{background-image: url(https://imgur.com/ftowh0s.png);}
emoji.lmao{background-image: url(https://i.imgur.com/MllSy5N.png);}
emoji.happy{background-image: url(https://imgur.com/5WUpcPZ.png);}
emoji.pizza{background-image: url(https://imgur.com/voEvJld.png);}
emoji.cryalot{background-image: url(https://i.imgur.com/UUrRRo6.png);}
emoji.books{background-image: url(https://i.imgur.com/UjZLf1R.png);}
emoji.moai{background-image: url(https://imgur.com/uSpaYy8.png);}
emoji.suffocated{background-image: url(https://i.imgur.com/jfTyB5F.png);}
emoji.scream{background-image: url(https://i.imgur.com/tOLNJgg.png);}
emoji.hearth_blue{background-image: url(https://i.imgur.com/gR9juts.png);}
emoji.funny{background-image: url(https://i.imgur.com/qKia58V.png);}
emoji.shit{background-image: url(https://i.imgur.com/H5Jba8r.png);}

@-webikt-keyframes pulse {
  from { opacity: 0; }
  to { opacity: 0.5; }
}

::-webkit-scrollbar {
    min-width: 12px;
    width: 12px;
    max-width: 12px;
    min-height: 12px;
    height: 12px;
    max-height: 12px;
    background: #252C33;
    box-shadow: inset 0px 50px 0px rgba(27,35,42,0.9), inset 0px -50px 0px #eee;
}

::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 100px;
    border: solid 3px #252C33;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.1);
}

::-webkit-scrollbar-thumb:active {
    background: rgba(255,255,255,0.1);
}

::-webkit-scrollbar-button {
    display: block;
    height: 26px;
}

/* T Y P E */
.typezone{
    position: fixed;
    bottom: 0px;
    left: 0px;
    right: 0px;
    width: 100%;
    height: 50px;
    z-index: 99;
    background: #eee;
    border: none;
    outline: none;
}
textarea, textarea:hover {
    position: absolute;
    bottom: 0px;
    left: 8%;
    right: 8%;
    width: 80%;
    height: 30px;
    z-index: 100;
    background: #fafafa;
    border: none;
    outline: none;
    padding-left: 2%;
    padding-right: 2%;
    padding-top: 2%;
    color: #666;
    font-weight: 400;
    border-top-right-radius: 10px;
    border-top-left-radius: 10px;
    overflow: hidden;
    resize: none;
    z-index: 200;
    box-shadow: 0px 0px 10px rgba(0,0,0,0.2);
    transition: all .4s cubic-bezier(0.565, -0.260, 0.255, 1.410);
}
textarea:focus {
    height: 300px;
    box-shadow: 0px 0px 20px rgba(0,0,0,0.3);
}
.emojis {
    position: fixed;
    display: block;
    bottom: 0px;
    left: 0px;
    width: 8%;
    height: 50px;
    background-image: url(https://i.imgur.com/VAn5Geq.png);
    background-repeat: no-repeat;
    background-size: 34px 34px;
    background-position: 45% 9px;
    z-index: 100;
    cursor: pointer;
}
.emojis:active {
    opacity: 0.9;
}
.send {
    position: fixed;
    display: block;
    bottom: 0px;
    right: 0px;
    width: 8%;
    height: 50px;
    border: none;
    outline: none;
    z-index: 100;
    cursor: pointer;
    background-image: url(https://i.imgur.com/VSQxJKL.png);
    background-repeat: no-repeat;
    background-size: 34px 34px;
    background-position: 45% 9px;
    background-color: rgba(255,255,255,0);
}
.send:active {
    opacity: 0.85;
}

/* R E S P O N S I V E   C O N F I G U R A T I O N */

@media screen and (max-width: 750px) {
    ::-webkit-scrollbar {
    display: none;
    }
    .chat{
        margin-bottom: 55px;
    }
    .msg p {
        font-size: 11px;
    }
    .msg .user {
        font-size: 13px;
    }
    .msg img {
        width: 300px;
    }
    .chat .notification {
        font-size: 12px;
        margin: 7px 30%;
        width: 40%;
    }
    .chat .day {
        font-size: 11px;
    }
    .emojis {
        width: 25%;
    }
    .send {
        width: 25%;
    }
    textarea {
        left: 0px;
        right: 0px;
        bottom: 50px;
        padding-left: 5%;
        padding-right: 5%;
        padding-top: 20px;
        width: 90%;
        border-radius: 0px;
        height: 28px;
        background: #fafafa;
        box-shadow: none;
        transition: all .4s cubic-bezier(0.2, -0.2, 0.2, 1.2);
    }
    textarea:focus {
        height: 30vh;
        margin-top: 30vh;
        box-shadow: 0px -20px 20px rgba(0,0,0,0.1);
    }
    form:focus ~ .typezone {
        bottom: 50vh;
    }
}
@media screen and (max-width: 550px) {
    .msg p {
        max-width: 250px;
    }
    .msg img {
        width: 200px;
    }
    .chat .notification {
        font-size: 12px;
        margin: 7px 0px;
        width: 100%;
        border-radius: 0px;
    }
    .chat .notification time {
        right: 10px;
    }
}
!

JS 

              
                //Nope today :3
!
999px

Console