<div class="wrapper">
  <div class="container">
    <h1>Welcome</h1>
    
    <form class="form">
      <input type="text" placeholder="Username">
      <input type="password" placeholder="Password">
      <button type="submit" id="login-button">Login</button>
    </form>
  </div>
  
  <ul class="bg-bubbles">
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
  </ul>
</div>

@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:200,300);

@prim: #53e3a6;

*{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  
  font-weight: 300;
}

body{
  font-family: 'Source Sans Pro', sans-serif;
  color: white;
  font-weight: 300;
  
  ::-webkit-input-placeholder { /* WebKit browsers */
    font-family: 'Source Sans Pro', sans-serif;
      color:    white;
    font-weight: 300;
  }
  :-moz-placeholder { /* Mozilla Firefox 4 to 18 */
    font-family: 'Source Sans Pro', sans-serif;
     color:    white;
     opacity:  1;
    font-weight: 300;
  }
  ::-moz-placeholder { /* Mozilla Firefox 19+ */
    font-family: 'Source Sans Pro', sans-serif;
     color:    white;
     opacity:  1;
    font-weight: 300;
  }
  :-ms-input-placeholder { /* Internet Explorer 10+ */
    font-family: 'Source Sans Pro', sans-serif;
     color:    white;
    font-weight: 300;
  }
}

.wrapper{
  background: #50a3a2;
background: -webkit-linear-gradient(top left, #50a3a2 0%, #53e3a6 100%);
background: -moz-linear-gradient(top left, #50a3a2 0%, #53e3a6 100%);
background: -o-linear-gradient(top left, #50a3a2 0%, #53e3a6 100%);
background: linear-gradient(to bottom right, #50a3a2 0%, #53e3a6 100%);
  
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 400px;
  margin-top: -200px;
  overflow: hidden;
  
  &.form-success{
    .container{
      h1{
        transform: translateY(85px);
      }
    }
  }
}

.container{
  max-width: 600px;
  margin: 0 auto;
  padding: 80px 0;
  height: 400px;
  text-align: center;
  
  h1{
    font-size: 40px;
    transition-duration: 1s;
    transition-timing-function: ease-in-put;
    font-weight: 200;
  }
}

form{
  padding: 20px 0;
  position: relative;
  z-index: 2;
  
  input{
    display: block;
    appearance: none;
    outline: 0;
    border: 1px solid fade(white, 40%);
    background-color: fade(white, 20%);
    width: 250px;
    
    border-radius: 3px;
    padding: 10px 15px;
    margin: 0 auto 10px auto;
    display: block;
    text-align: center;
    font-size: 18px;
    
    color: white;
    
    transition-duration: 0.25s;
    font-weight: 300;
    
    &:hover{
      background-color: fade(white, 40%);
    }
    
    &:focus{
      background-color: white;
      width: 300px;
      
      color: @prim;
    }
  }
  
  button{
    appearance: none;
    outline: 0;
    background-color: white;
    border: 0;
    padding: 10px 15px;
    color: @prim;
    border-radius: 3px;
    width: 250px;
    cursor: pointer;
    font-size: 18px;
    transition-duration: 0.25s;
    
    &:hover{
      background-color: rgb(245, 247, 249);
    }
  }
}

.bg-bubbles{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  
  z-index: 1;
  
  li{
    position: absolute;
    list-style: none;
    display: block;
    width: 40px;
    height: 40px;
    background-color: fade(white, 15%);
    bottom: -160px;
    
    -webkit-animation: square 25s infinite;
    animation:         square 25s infinite;
    
    -webkit-transition-timing-function: linear;
    transition-timing-function: linear;
    
    &:nth-child(1){
      left: 10%;
    }
    
    &:nth-child(2){
      left: 20%;
      
      width: 80px;
      height: 80px;
      
      animation-delay: 2s;
      animation-duration: 17s;
    }
    
    &:nth-child(3){
      left: 25%;
      animation-delay: 4s;
    }
    
    &:nth-child(4){
      left: 40%;
      width: 60px;
      height: 60px;
      
      animation-duration: 22s;
      
      background-color: fade(white, 25%);
    }
    
    &:nth-child(5){
      left: 70%;
    }
    
    &:nth-child(6){
      left: 80%;
      width: 120px;
      height: 120px;
      
      animation-delay: 3s;
      background-color: fade(white, 20%);
    }
    
    &:nth-child(7){
      left: 32%;
      width: 160px;
      height: 160px;
      
      animation-delay: 7s;
    }
    
    &:nth-child(8){
      left: 55%;
      width: 20px;
      height: 20px;
      
      animation-delay: 15s;
      animation-duration: 40s;
    }
    
    &:nth-child(9){
      left: 25%;
      width: 10px;
      height: 10px;
      
      animation-delay: 2s;
      animation-duration: 40s;
      background-color: fade(white, 30%);
    }
    
    &:nth-child(10){
      left: 90%;
      width: 160px;
      height: 160px;
      
      animation-delay: 11s;
    }
  }
}

@-webkit-keyframes square {
  0%   { transform: translateY(0); }
  100% { transform: translateY(-700px) rotate(600deg); }
}
@keyframes square {
  0%   { transform: translateY(0); }
  100% { transform: translateY(-700px) rotate(600deg); }
}

 $("#login-button").click(function(event){
     event.preventDefault();
   
   $('form').fadeOut(500);
   $('.wrapper').addClass('form-success');
});