<div class="windowSeat">
  <div class="window">
    <div class="clouds"></div>
    <div class="wing"></div>
       <input id='flap' type='checkbox'>
    <label class='flap' for='flap'></label>
  </div>
</div>
body {
  display: flex;
  align-items: center;
  justify-content: center;
  height:100vh;
}

.windowSeat {
  position: relative;
}

.window {
  position: relative;
  width:150px;
  height: 200px;
  background-color: #90e0ef;
  border: 10px solid #e9ecef;
  border-radius: 70px;
  overflow: hidden;
  box-shadow: inset 5px 5px 25px rgba(0,0,0,0.3);
}

.clouds {
  position: absolute;
  top:100px;
  background-color: #caf0f8;
  border-radius:50%;
  width: 50px;
  height: 50px;
  left:0;
  box-shadow: 40px 20px #caf0f8, 85px 40px #caf0f8, 105px 30px #caf0f8, 70px 20px #caf0f8, -10px 20px #caf0f8, 130px 10px #caf0f8, 170px 20px #caf0f8, 200px 30px #caf0f8;
  animation: move 10s linear infinite;
}

@keyframes move {
  from {left:-100px};
  to {left: 100px};
}

.clouds:before {
  content:"";
  position: absolute;
  border-radius:50%;
  background-color: #fff;
  width:50px;
  height: 50px;
  top:30px;
  left:-10px;
  box-shadow: 30px 30px #fff, 70px 20px #fff, 60px 50px #fff, 105px 30px #fff, 140px 10px #fff, 140px 40px #fff, 170px 10px #fff, 200px 20px #fff, 180px 40px #fff, 240px 10px #fff;
}

.wing {
  position: absolute;
  width: 40px;
  height:0;
  border-bottom: 200px solid #ced4da;
  border-left: 30px solid transparent;
  border-right: 30px solid transparent;
  top: 50px;
  left:-10px;
  transform: rotateX(45deg) skew(-30deg);
}

.wing:before {
  content:"";
  position: absolute;
  width: 20px;
  height:0;
  border-bottom: 200px solid rgba(0,0,0,0.1);
  border-right: 22px solid transparent;
  left:24px;
  transform: rotate(-2deg);
}

.flap {
  position: absolute;
  width: 200px;
  height: 250px;
  background-color: #dee2e6;
  border-radius:80px;
  left:-20px;
  top:-200px;
  cursor: pointer;
  transition: .3s;
  box-shadow: 5px 5px 15px rgba(0,0,0,0.2);
}

.flap:before {
  content:"";
  position: absolute;
  width:40px;
  height:10px;
  border-radius:10px;
  background-color: #adb5bd;
  top:230px;
  left:75px;
}

input#flap {
  display: none;
}

#flap:checked + .flap {
  transform: translateY(150px);
}

// click on window shade to open/close the window.
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