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              <div id="back">
  <div class="backRight"></div>
  <div class="backLeft"></div>
</div>

<div id="slideBox">
  <div class="topLayer">
    <div class="left">
      <div class="content">
        <h2>Sign Up</h2>
        <form method="post" onsubmit="return false;">
          <div class="form-group">
            <input type="text" placeholder="username" />
          </div>
          <div class="form-group"></div>
          <div class="form-group"></div>
          <div class="form-group"></div>
        </form>
        <button id="goLeft" class="off">Login</button>
        <button>Sign up</button>
      </div>
    </div>
    <div class="right">
      <div class="content">
        <h2>Login</h2>
        <form method="post" onsubmit="return false;">
          <div class="form-group">
            <label for="username" class="form-label">Username</label>
            <input type="text" />
          </div>
          <button id="goRight" class="off">Sign Up</button>
          <button id="login" type="submit">Login</button>
        </form>
      </div>
    </div>
  </div>
</div>

<!--Inspiration from: http://ertekinn.com/loginsignup/-->
            
          
!
            
              body {
  height: 100%;
  overflow: hidden;
  width: 100% !important;
  box-sizing: border-box;
  font-family: 'Roboto', sans-serif;
}



.backRight {
  position: absolute;
  right: 0;
  width: 50%;
  height: 100%;
  background: #3498db url(https://download.unsplash.com/photo-1429041966141-44d228a42775);
  background-size: cover;
  background-position: 50% 50%;
}

.backLeft {
  position: absolute;
  left: 0;
  width: 50%;
  height: 100%;
  background: #e74c3c url(https://download.unsplash.com/photo-1428279148693-1cf2163ed67d);
  background-size: cover;
  background-position: 50% 50%;
}

#back {
  width: 100%;
  height: 100%;
  position: absolute;
  z-index: -999;
}

#slideBox {
  width: 50%;
  max-height: 100%;
  height: 100%;
  overflow: hidden;
  margin-left: 50%;
  position: absolute;
  box-shadow: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
}
.topLayer {
  width: 200%;
  height: 100%;
  position: relative;
  left: 0;
  left: -100%;
}

.left {
  width: 50%;
  height: 100%;
  background: #2C3034;
  left: 0;
  position: absolute;
}

.right {
  width: 50%;
  height: 100%;
  background: #f9f9f9;
  right: 0;
  position: absolute;
}

.content {
  width: 250px;
  margin: 0 auto;
  top: 30%;
  position: absolute;
  left: 50%;
  margin-left: -125px;
}

.content h2 {
  color: #03A9F4;
  font-weight: 300;
  font-size: 35px;
}

button {
  background: #03A9F4;
  padding: 10px 16px;
  width: auto;
  font-weight: 600;
  text-transform:  uppercase;
  font-size: 14px;
  color: #fff;
  line-height: 16px;
  letter-spacing: 0.5px;
  border-radius: 2px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1), 0 3px 6px rgba(0,0,0,0.1);
  border: 0;
  outline: 0;
  margin: 15px 15px 15px 0;
  transition: all 0.25s;
}

button:hover {
  background: #0288D1;
  box-shadow: 0 4px 7px rgba(0,0,0,0.1), 0 3px 6px rgba(0,0,0,0.1);
}
.off {
  background: none;
  color: #03A9F4;
  box-shadow: none;
}

.right .off:hover {
  background: #eee;
  color: #03A9F4;
  box-shadow: none;
}
.left .off:hover {
  box-shadow: none;
  color: #03A9F4;
  background: #363A3D;
}
input {
  background: transparent;
  border: 0;
  outline: 0;
  border-bottom: 1px solid #45494C;
  font-size: 14px;
  color: #959595;
  padding: 8px 0;
  margin-top: 20px;
}
            
          
!
            
              $(document).ready(function(){
  $('#goRight').on('click', function(){
    $('#slideBox').animate({
      'marginLeft' : '0'
    });
    $('.topLayer').animate({
      'marginLeft' : '100%'
    });
  });
  $('#goLeft').on('click', function(){
    $('#slideBox').animate({
      'marginLeft' : '50%'
    });
    $('.topLayer').animate({
      'marginLeft': '0'
    });
  });
});
            
          
!
999px
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