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HTML

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                .refresh
  %svg{:height => "50", :viewBox => "0 0 50 50", :width => "50", :xmlns => "http://www.w3.org/2000/svg"}
    %path{:d => "M26.083 13C32.665 13 38 18.374 38 25.003c0 6.5-5.13 11.794-11.534 11.997v-2.184c5.207-.202 9.367-4.518 9.367-9.813 0-5.424-4.365-9.82-9.75-9.82-4.83 0-8.84 3.54-9.615 8.183H18.5l-3.25 3.82-3.25-3.82h2.277C15.07 17.51 20.053 13 26.083 13z", :fill => "#191747", "fill-rule" => "evenodd"}/
    
.main-ctr
  .calendar-ctr

    .top-ctr
      .top.top-0

      - (1..28).each do |i|
        .top{:class => "top-#{i}"}
          .number #{i}

      .top-29
        .number 29

    .bottom-ctr
      .bottom.bottom-0

      - (1..29).each do |i|
        .bottom{:class => "bottom-#{i}"}
          .number #{i}
!

CSS 

              
                @import "bourbon";
@import url(https://fonts.googleapis.com/css?family=Roboto:400,300,500);
@import url(https://fonts.googleapis.com/css?family=Quicksand:400,700);

html,
body {
  display: table;
  width: 100%;
  height: 100%;
  background: #f8f8f8;
}

.main-ctr {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
}

.calendar-ctr {
  width: 200px;
  height: 200px;
  margin: 0 auto;
  display: block;
  position: relative;
  @include perspective(500px);
  font-family: Roboto;
  font-weight: 400;
  
  .top {
    @include position(absolute, 0 0 x 0);
    height: 50%;
    background: #3C75D3;
    border-top-left-radius: 15px;
    border-top-right-radius: 15px;
    overflow: hidden;
    @include transform-origin(center bottom);
    will-change: transform;
    
    &:before {
      content: "";
      @include position(absolute, 0 0 0 0);
      border-top: 1px solid rgba(0,0,0,.25);
      border-top-left-radius: 15px;
      border-top-right-radius: 15px;
      border-bottom: 1px solid rgba(255,255,255,.05);
    }
    
    &.top-0 {
      background: #ddd;
    }
    
    @for $i from 0 through 29 {
      
      &.top-#{$i} {
        z-index: 29 - $i;
      }
      
    }
    
    .number {
      @include position(absolute, 0 0 -100% 0);
      text-align: center;
      line-height: 200px;
      font-size: 120px;
      color: white;
      text-shadow: 2px 2px rgba(0,0,0,.05);
    }
  }
    
  .top-29 {
    @include position(absolute, 0 0 x 0);
    height: 50%;
    background: #3C6BD2;
    border-top-left-radius: 15px;
    border-top-right-radius: 15px;
    overflow: hidden;
    @include transform-origin(center bottom);
    will-change: transform;
    
    &:before {
      content: "";
      @include position(absolute, 0 0 0 0);
      border-top: 1px solid rgba(0,0,0,.25);
      border-top-left-radius: 15px;
      border-top-right-radius: 15px;
      border-bottom: 1px solid rgba(255,255,255,.05);
    }
    
    .number {
      @include position(absolute, 0 0 -100% 0);
      text-align: center;
      line-height: 200px;
      font-size: 120px;
      color: white;
      text-shadow: 2px 2px rgba(0,0,0,.05);
    }
  }
  
  .bottom {
    @include position(absolute, x 0 0 0);
    height: 50%;
    background: #4887F2;
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    overflow: hidden;
    @include transform-origin(center top);
    @include transform(rotateX(90deg));
    will-change: transform;
    
    &:before {
      content: "";
      @include position(absolute, 0 0 0 0);
      border-bottom: 1px solid rgba(0,0,0,.25);
      border-bottom-left-radius: 15px;
      border-bottom-right-radius: 15px;
      border-top: 1px solid rgba(0,0,0,.15);
    }
    
    @for $i from 0 through 29 {
      
      &.bottom-#{$i} {
        z-index: $i;
      }
      
    }
    
    &.bottom-0 {
      background: #eee;
      @include transform(rotateX(0deg));
    }
    
    .number {
      @include position(absolute, -100% 0 0 0);
      text-align: center;
      line-height: 200px;
      font-size: 120px;
      color: white;
      text-shadow: 2px 2px rgba(0,0,0,.05);
    }
  }
}

// refresh button
.refresh {
  @include position(fixed, 15px 15px x x);
  @include transform-origin(right top);
  @include transform(scale(.7));
  width: 50px;
  height: 50px;
  background: white;
  border-radius: 50%;
  z-index: 99;
  cursor: pointer;
  box-shadow: 0 1px 1px 1px rgba(0,0,0,.1);
}
!

JS 

              
                var tl = new TimelineMax({});

tl.set(".calendar-ctr", {
  scale: .75
})

tl.timeScale(1);

tl.staggerTo(".bottom", .3, {
    rotationX: "0deg",
  }, .3)
  
  .staggerTo(".top", .3, {
    rotationX: "-90deg"
  }, .3, 0)

  .to(".calendar-ctr", 9, {
    scale: 1
  }, 0)

// restart animation
var refresh = document.querySelector(".refresh");
refresh.addEventListener("click", function(){
  tl.restart();
})
!
999px

Console