Opening Advent Calendar Door

index.html

<h2>Click on the red door to open it</h2>
<div class="door-frame">
  <div class="door"></div>
  <div class="star"></div>
</div>

opening-advent-calendar-door.markdown

Opening Advent Calendar Door

Advent calendar door with CSS star behind - opens on click with transform transition

More info at http://www.red-route.org/articles/opening-doors-advent

Credit due to Ana Tudor and David DeSandro for some tutorials.

A Pen by malcomio on CodePen.

License.

script.js

$('.door-frame').click(function () {
  $(this).find('.door').toggleClass('open');
});

scripts

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

style.scss

body {
  text-align: center;
}

.door-frame {
  position: relative;
  perspective: 150px;
  border: 1px solid red;
  width: 100px;
  height: 75px;
  margin: 2em auto;
  cursor: pointer;
}

.door {
  border: 1px solid red;
  display: block;
  position: absolute;
  background: red;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 1;

  transform: rotateY(0deg);
  transform-origin: 0;
  transition-property: all;
  transition-duration: 0.5s;
  
  &.open {
    transform: rotateY(-120deg);
    transform-origin: 0 50% 0;
    width: 15%;
  }
}

$star_size: 25px;
$star_offset: 15px;

.star {
  position: absolute;
  width: 0;
  height: 0;
  border-left: $star_size solid transparent;
  border-right: $star_size solid transparent;
  border-bottom: ($star_size + $star_offset) solid red;
  top: $star_size - $star_offset;
  left: $star_size;
  line-height: 0;
  font-size: 0;

  &:after {
    content:"";
    position: absolute;
    width: 0;
    height: 0;
    border-left: $star_size solid transparent;
    border-right: $star_size solid transparent;
    border-top: ($star_size + $star_offset) solid red;
    margin: $star_offset 0 0 -$star_size;
    top: 0;
    left: -$star_size;
    line-height: 0;
  }
}