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HTML 

              
                div.container
  div.background.night
    div.overlay
    div.sun
    div.moon
    div.stars
    div.cloud.top
    div.cloud.mid
    div.cloud.bot-backup
    div.forest-top
    div.forest-bot
  div.text
    h3 Night mode on
    p Toggle switch to change lighting
    input(type="checkbox").cbx.hidden#unchecked
    label(for="unchecked").lbl
!

CSS 

              
                @import "compass";
$container-width:350px;
$container-height:400px;

body{
  background:#d4e3e6;
}

.container{
  position:absolute;
  top:50%;
  left:50%;
  margin-top:-$container-height/2; 
  margin-left:-$container-width/2;
  
  width:$container-width;
  background:#fff;
  @include border-radius(10px);
  
  .background{
    height:252px;
    position:relative;
    overflow:hidden;
    @include border-radius(10px 10px 0 0);
    @include transition-property(background);
    @include transition-duration(2s);
    
    .forest-top svg polygon,
    .forest-bot svg path{
      @include transition-property(fill);
      @include transition-duration(2s);
    }
    
    .stars{
      opacity:0;
      @include transition-property(opacity);
      @include transition-duration(2s);
    }
    
    &.day{
      background-color:#0aceff;
      
      .cloud{
        opacity:1
      }
      
      .forest-top svg polygon{
        fill:#149cbf;
      }
      
      .forest-bot svg path{
        fill:#0d87a3;
      }
    }
    
    &.night{
      background-color:#172a60;
      
      .forest-top svg polygon{
        fill:#18214f;
      }
      
      .forest-bot svg path{
        fill:#172a60;
      }
      
      .cloud{
        opacity:0.2
      }
      
      .stars{
        opacity:0.28;
      }
    }
    
    .overlay{
      position:absolute;
      z-index:10;
      width:0;
      height:0;
      border-top:252px solid rgba(255, 255, 255, 0.06);
      border-right:350px solid transparent;
    }
    
    .cloud{
      position:absolute;
      width:100px;
      @include transition-property(opacity);
      @include transition-duration(2s);
      
      &.top{
        top:-15px;
        left:0px;
      }
      &.top-backup{
        top:-15px;
        left:-100px;
      }
      
      &.mid{
        top:35px;
        left:200px;
      }
      
      &.mid-backup{
        top:35px;
        left:0px;
      }
      
      &.bot{
        top:65px;
        left:-30px;
      }
      &.bot-backup{
        top:65px;
        left:-230px;
      }
    }
    
    .forest-top,
    .forest-bot{
      position:absolute;
      bottom:-3px;
    }
    .forest-top{
      bottom:10px;
    }
    
    .moon,.sun{ 
      bottom:-40px; 
    }
    
    .moon{
      position:absolute;
      left:10px;
      transform: scale(0.6, 1);
      
      svg{
        width:150px;
        height:150px;
      }
    }
    
    .sun{
      position:absolute;
      left:10px;
      
      svg{
        width:150px;
        height:150px;
      }
    }
  }
  
  .text{
    text-align:center;
    color:#172a60;
    font-family: Arial,"Helvetica Neue",Helvetica,sans-serif;
    h3{
      font-size:26px;
      font-weight:bold;
      padding-top:35px;
    } 
    p{
      color:#69738e;
      font-size:13px;
      margin-top:10px;
    }
    
    .lbl{
      position: relative;
      display: block;
      height: 34px;
      width: 65px;
      background: #dfe4f5;
      border-radius: 100px;
      cursor: pointer;
      transition: all 0.3s ease;
      margin: 30px auto;
      
      &:after{
        position: absolute;
        right: -4px;
        top: -2px;
        display: block;
        width: 38px;
        height: 38px;
        border-radius: 30px;
        background: #172a60;
        @include box-shadow(0px 2px 5px -1px rgba(23,42,96,0.75));
        content: '';
        transition: all 0.3s ease;
      }
      
      &:active:after{
        transform: scale(1.15, 0.85);
      }
    }
    .cbx:checked ~ label {
      background: #cee7ed; 
    }

    .cbx:checked ~ label:after {
      left: -2px;
      background: #00ccff;
      @include box-shadow(0px 2px 5px -1px rgba(0,204,255,0.75));
    }

    .hidden { display: none; }
  }
  
  &.day{
    h3{
      color:#0c8faf;
    }
    
  }
}
!

JS 

              
                $(function() {
  var svg = [
    'https://dl.dropboxusercontent.com/s/wppjkl1mapcofi1/egles_dark.svg?dl=0',
    'https://dl.dropboxusercontent.com/s/1tluv1o16bu8dv1/egles_light.svg?dl=0',
    'https://dl.dropboxusercontent.com/s/df61ibt6hk9mk2z/sun.svg',
    'https://dl.dropboxusercontent.com/s/z5nkite52l21gnn/moon.svg',
    'https://dl.dropboxusercontent.com/s/a24sxazrdbnkn4q/stars.svg?dl=0',
    'https://dl.dropboxusercontent.com/s/n329j6mekvr5mec/makonis_1.svg?dl=0',
    'https://dl.dropboxusercontent.com/s/jpd6t207d4s1ozo/makonis_2.svg?dl=0'
  ];

  $('.forest-top').load(svg[0]);
  $('.forest-bot').load(svg[1]);
  $('.sun').load(svg[2]);
  $('.moon').load(svg[3]);
  $('.stars').load(svg[4]);

  $('.cloud.top, .cloud.top-backup').load(svg[5]);
  $('.cloud.mid, .cloud.mid-backup').load(svg[6]);
  $('.cloud.bot, .cloud.bot-backup').load(svg[5]);

  TweenLite.to($('.moon'), 0, {
    bottom: '40px',
    scale: 1
  });

  $('.cloud').each(function() {
    tweenCloud($(this));
  });

  $('.cbx').bind('change', function() {
    daySwap();
  });
});

tweenCloud = function($cloud) {
  var offset = $cloud.position(),
    speed = (450 - offset.left) / 10;
  TweenLite.to($cloud, speed, {
    left: '350px',
    onComplete: function() {
      TweenLite.to($cloud, 0, {
        left: '-300px',
        //top: 120 - (Math.random() * 140) + 'px',
        onComplete: function() {
          tweenCloud($cloud)
        }
      })
    }
  })

}

daySwap = function() {
  var $cbx = $('.cbx'),
    day = !$cbx.is(':checked'),
    $sun = $('.sun'),
    $moon = $('.moon'),
    bounceSize = 75,
    visiblePosition = 45;
  $('h3').fadeOut(function() {
    $(this).text(((day) ? 'Night' : 'Day') + ' mode on').fadeIn();
  $('.container').toggleClass('day');
  $('.background').removeClass((day) ? 'day' : 'night').addClass((day) ? 'night' : 'day');
  });

  TweenLite.to((day) ? $sun : $moon, 0.2, {
    bottom: bounceSize + 'px',
    scaleX: 0.6,
    ease: Bounce.easeOut
  });
  TweenLite.to((day) ? $sun : $moon, 0.3, {
    bottom: '-40px',
    ease: Power4.easeOut,
    delay: 0.2
  });
  TweenLite.to((day) ? $sun : $moon, 0, {
    scaleX: 1
  })

  TweenLite.to((day) ? $moon : $sun, 0.5, {
    bottom: bounceSize + 'px',
    scaleX: 1,
    scaleY: 0.6,
    ease: Bounce.easeOut,
    delay: 1
  });
  TweenLite.to((day) ? $moon : $sun, 0.4, {
    bottom: visiblePosition + 'px',
    ease: Bounce.easeOut,
    scaleY: 1,
    delay: 1.2
  });

}
!
999px

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