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CSS

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HTML 

              
                <div class="wrapper">
  <header>
    <a href="#" class="btn btn_left">
      <span></span>
      <span></span>
      <span></span>
    </a>
    <div class="title">
      <h1>Twitter</h1>
    </div>
    <a href="#" class="btn btn_right">
      <i class="fa fa-pencil-square-o"></i>
    </a>
  </header>
  <div class="banner">
    <div class="avatar-container">
      <a href="">
        <img class="avatar" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/31787/profile/profile-512_3.jpg" alt="" />
        <i class="fa fa-pencil"></i>
      </a>
    </div>
  </div>

  <div class="profile-info">
    <ul>
      <li>
        Tweets
        <span>1,252</span>
      </li>
      <li>
        Following
        <span>371</span>
      </li>
      <li>
        Followers
        <span>1,252</span>
      </li>    
    </ul>
  </div>
  <div class="profile-tweets">
    <ul>
      <li class="title">
        Tweets
      </li>
      <li>
        <img class="avatar" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/31787/profile/profile-512_3.jpg" alt="" />
        <div class="tweet-content">        
          <h5 class="tweet-user">
            Hugo Darby-Brown
            <span class="tweet-handle">
              @DarbyBrown
            </span>
            <span class="tweet-date">
              1h
            </span>
          </h5>
          <p>
            <a>@twholman</a> <a>@CodePen</a> Got another one for you :) <a>https://codepen.io/hugo/pen/lIhHj </a>
          </p>
        </div>
        
      </li>
      <li>
        <img class="avatar" src="https://pbs.twimg.com/profile_images/3321327798/83ed9a740af0aa27fdcb3a35b1855085_bigger.jpeg" alt="" />
        <div class="tweet-content">        
          <h5 class="tweet-user">
            Dillon de Voor   
            <span class="tweet-handle">
              ‏@CrocoDillon
            </span>
            <span class="tweet-date">
              12h
            </span>
          </h5>
          <p>
            Made a single element Slack loader, an idea proposed by <a>@FWeinb</a> in our Slack channel. <a<@SlackHQ</a> <a>@4ae9b8</a>

        <a>https://codepen.io/CrocoDillon/pen/Htycs</a> … via <a>@codepen</a>
          </p>
        </div>
      </li>      
      <li>
        <img class="avatar" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/31787/profile/profile-512_3.jpg" alt="" />
        <div class="tweet-content">        
          <h5 class="tweet-user">
            Hugo Darby-Brown
            <span class="tweet-handle">
              @DarbyBrown
            </span>
            <span class="tweet-date">
              9 Feb
            </span>
          </h5>
          <p>
            Selling an iPhone with flappy bird on it £10,000, and takers?
          </p>
        </div>
      </li>
      <li>
        <img class="avatar" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/31787/profile/profile-512_3.jpg" alt="" />
        <div class="tweet-content">        
          <h5 class="tweet-user">
            Hugo Darby-Brown
            <span class="tweet-handle">
              @DarbyBrown
            </span>
            <span class="tweet-date">
              9 Feb
            </span>
          </h5>
          <p>
            <a>@thebabydino</a> <a>@CodePen</a> Thanks Ana :)
          </p>
        </div>
      </li>

      <li>
        <img class="avatar" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/31787/profile/profile-512_3.jpg" alt="" />
        <div class="tweet-content">        
          <h5 class="tweet-user">
            Hugo Darby-Brown
            <span class="tweet-handle">
              @DarbyBrown
            </span>
            <span class="tweet-date">
              9 Feb
            </span>
          </h5>
          <p>
            Sass Rainbow Box-shadow Animation  - CodePen <a>https://codepen.io/hugo/pen/mqhHw</a>  via <a>@codepen</a>
          </p>
        </div>
      </li>
    </ul>
  </div>

<div class="compose-tweet">
  <h3>Compose Tweet</h3>
  <form action="#">
    <textarea name="" id="" cols="30" rows="10"></textarea>
    <input type="submit" value="tweet" />
  </form>
</div>
</div>
!

CSS 

              
                @import "compass/css3";

$primary: #05d5fc;
$secondary: darken($primary,10%);
$white: #fafafa;

*, *:after, *:before {
  box-sizing: border-box; 
}

%cf:before,
%cf:after {
  content: " "; 
  display: table;
}

%cf:after {
  clear: both;
}

html {
  background: #252527 ;
  height: 100%;
}

.wrapper {
  background: #242328;
  box-shadow: 0 0 0.5em black;
  height: 45em;
  margin: 0 auto;
  max-width: 25em;
  overflow: hidden;
  position: relative;
  width: 100%; 
}

header {
  background: #1C1B20;
  border-bottom: 0.2em solid #131316;
  box-shadow: 0 0.1em 0.2em rgba(#111, 0.5);
  height: 4em;
  width: 100%; 

  .btn {
    display: block;
    height: 100%;
    width: 20%; 
  }


  .btn_left {
    border-right: 0.1em solid #131316;    
    float: left;
    padding: 0.8em 0;    

    span {
      background: $primary;
      box-shadow: 0 0 0.4em $primary;
      display: block;
      height: 0.25em;
      margin: 0.35em auto;
      width: 50%;
    }
  }

  .btn_right {
    border-left: 0.1em solid #29272e;  
    float: right;
    padding: 1em 1.5em;    

    i {
      color: $primary;
      font-size: 2em;
      text-shadow: 0 0 0.4em $primary;         
    }
    
  }

  .title {
    border-left: 0.1em solid #29272e;
    border-right: 0.1em solid #131316;
    float: left;
    height: 100%;
    width: 60%; 

    h1 {
      color: $white;
      font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
      font-size: 1.4em;
      font-weight: 400;
      margin: 0.8em;
      text-align: center;
      text-shadow: 
        0.05em 0.05em 0.05em rgba(#222, 0.4),
        -0.05em -0.05em 0.05em rgba(#fafafa, 0.4);
      text-transform: uppercase;
    }
  }
}

.banner {
  background: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/31787/twitter-bg_1.jpg);
  background-size: cover;
  border-bottom: 0.2em solid #131316;
  box-shadow: 
    inset 0 -0.1em 0.2em rgba(#111, 0.5); 
  height: 10.5em;
  padding: 1.5em 0;
  width: 100%;

  .avatar-container {
    background: linear-gradient(45deg, $primary, $secondary);
    border-radius: 0.2em;
    box-shadow: 0 0 0.3em $primary,
      0 -0.2em 0.5em rgba(#222,0.5);
    margin: 0 auto;
    position: relative;
    width: 8em; 

    i {
      color: #fff;
      bottom: 1em;
      position: absolute;
      right: 1em;
      text-shadow: 0 0 0.3em rgba($white,0.4);
    }
    
    
  }
  .avatar {
    border: 0.5em solid #222;
    margin: 2.5% 2.5% 1%;
    width: 95%; 
  }
}

.profile-info {
  background: #121215;
  box-shadow: 
    0 -2em 0 #1c1b20,
    0 -2.2em 0 #131316,
    inset 0 -0.1em 0.2em rgba(#111, 0.8),
    inset 0 0.1em 0.2em rgba(#111, 0.8);
  border-bottom: 
    0.075em solid darken($secondary,20%);
  border-top: 
    0.075em solid darken($secondary,20%); 
  width: 100%; 

  ul {
    list-style: none;
    margin: 0;
    padding: 0;
    text-align: center;
  }

  li {
    color: #ccc;
    display: inline-block; 
    margin: 3% 0;
    padding: 0 5%;
    text-shadow: 
      0.05em 0.05em 0.05em rgba(#222, 0.4),
      -0.05em -0.05em 0.05em rgba(#fafafa, 0.4);   

    &:nth-child(1), &:nth-child(2) {
      border-right: 0.1em solid #222;  
    }

    span {
      color: $secondary;
      display: block;
      font-size: 130%;
    }
  }
}

.profile-tweets {

  .title {
    color: $white;
  }

  ul {
    list-style: none;
    margin: 0;
    padding: 0; 
  }

  li {
    @extend %cf;
    border-bottom: 0.1em solid #29272e;     
    border-top: 0.1em solid #131316;
    padding: 0.5em;
  }

  .avatar {
    border-radius: 0.2em;
    border: 0.1em solid $secondary;
    float: left;
    width: 12.5%; 
  }

  .tweet-content {
    float: left;
    margin: 0;
    margin-left: 3%;
    width: 80%;

    p {
      color: #ccc;
      font-size: 0.75em;
      margin: 0;

      a {
        color: $secondary; 
        cursor: pointer;
        text-decoration: none;
      }
    }
  }

  .tweet-user {
    color: $white;
    float: right;
    font-size: 0.95em;
    font-weight: 400;
    margin: 0 0 0.3em;
    width: 100%; 

    span {
      color: #6b677a;
      font-size: 75%; 
    }
  }

  .tweet-handle:after {
    content: ' - ' 
      }
}

.compose-tweet {
  background: #242328;
  box-shadow: -0.5em 0 0.5em rgba(#111,0.8);
  left: 103%;
  height: 100%;
  padding: 1em;
  position: absolute;
  top: 19em;
  transition: 1s;
  width: 100%; 
  z-index: 99;

  h3 {
    color: $white;
    font-weight: 400;
    text-align: center;
    text-transform: uppercase;
  }

  textarea {
    background: #121215;
    box-shadow: 
      inset 0 -0.1em 0.2em rgba(#111, 0.8),
      inset 0 0.1em 0.2em rgba(#111, 0.8);
    width: 100%; 
  }

  input[type=submit] {
    background: none;
    border: 0.2em solid $primary;
    border-radius: 0.2em;
    color: $primary;
    margin-top: 1em;
    padding: 0.5em;
    width: 100%;

    &:active {
      background: $secondary;
      color: #121215;
    }
  }
}


.open {
  left: 0; 
}
!

JS 

              
                $('.btn_right').click(function(){
  $('.btn_right i').toggleClass('fa-pencil-square-o').toggleClass('fa-times');
   $(".compose-tweet").toggleClass('open');
});
!
999px

Console