body {
  position: relative;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
      -ms-flex-pack: center;
          justify-content: center;
  height: 100vh;
  background: silver;
}

.window {
  position: relative;
  padding: 20px;
  border: 4px solid #808080;
  border-radius: 48px;
  background-color: #D9D9D9;
  box-shadow: inset 0 0 80px rgba(0, 0, 0, 0.2), 0 0 0 40px whitesmoke, 0 0 0 44px #808080, 0 20px 40px 40px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}
.window:before {
  content: "";
  position: absolute;
  top: -10px;
  left: 0;
  width: 100%;
  height: 20px;
  background: black;
  opacity: 0.2;
  -webkit-filter: blur(10px);
          filter: blur(10px);
  pointer-events: none;
  z-index: 20;
}

.top {
  position: absolute;
  left: 0;
  top: -90%;
  width: 100%;
  height: 100%;
  border-radius: 48px;
  background: whitesmoke;
  box-shadow: 0 0 0 4px #808080, 0 0 30px rgba(0, 0, 0, 0.4);
  -webkit-transition: 0.6s all ease-in-out;
  transition: 0.6s all ease-in-out;
  cursor: pointer;
  z-index: 10;
}
.top.closed {
  top: -5%;
}
.top:before {
  content: "";
  display: block;
  width: 40%;
  height: 8px;
  position: absolute;
  bottom: 16px;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  border-radius: 4px;
  background-color: #808080;
}
.top:after {
  content: "";
  display: block;
  width: 16px;
  height: 8px;
  position: absolute;
  bottom: 16px;
  left: 50%;
  -webkit-transform: translateX(-50%);
          transform: translateX(-50%);
  border-radius: 4px;
  background-image: -webkit-radial-gradient(#5df254, #15a10c);
  background-image: radial-gradient(#5df254, #15a10c);
  -webkit-animation-name: light;
          animation-name: light;
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  -webkit-animation-timing-function: ease;
          animation-timing-function: ease;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
}

.glass {
  position: relative;
  width: 200px;
  height: 300px;
  border-radius: 72px;
  box-shadow: 0 0 0 4px #808080;
  overflow: hidden;
}
.glass:after {
  content: "";
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-image: -webkit-radial-gradient(circle farthest-corner at 90% 10%, rgba(255, 255, 255, 0.4) 0%, rgba(0, 0, 0, 0) 20%);
  background-image: radial-gradient(circle farthest-corner at 90% 10%, rgba(255, 255, 255, 0.4) 0%, rgba(0, 0, 0, 0) 20%);
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.2);
  border-radius: 72px;
}

.sky {
  position: relative;
  background: #3FA9F5;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.nyan-cat {
  position: absolute;
  top: 40%;
  width: 90px;
  height: 60px;
  background-image: url("../images/tenor.gif");
  background-size: contain;
  background-repeat: no-repeat;
  -webkit-animation-name: leftToRight;
          animation-name: leftToRight;
  -webkit-animation-duration: 5s;
          animation-duration: 5s;
  -webkit-animation-delay: 1s;
          animation-delay: 1s;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  z-index: -10;
}

.cloud {
  position: relative;
  width: 100px;
  height: 40px;
  background-color: white;
  border-radius: 40px;
  -webkit-animation-name: leftToRight;
          animation-name: leftToRight;
  -webkit-animation-duration: 2s;
          animation-duration: 2s;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
}
.cloud:before, .cloud:after {
  content: " ";
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: white;
  position: absolute;
}
.cloud:before {
  top: -20px;
  left: 20px;
}
.cloud:after {
  top: -10px;
  left: 50px;
}
.cloud:nth-child(1) {
  -webkit-animation-duration: 8s;
          animation-duration: 8s;
}
.cloud:nth-child(2) {
  top: 20%;
  -webkit-animation-delay: 0.2s;
          animation-delay: 0.2s;
  -webkit-animation-duration: 6s;
          animation-duration: 6s;
}
.cloud:nth-child(3) {
  top: 40%;
  -webkit-animation-duration: 4s;
          animation-duration: 4s;
}
.cloud:nth-child(4) {
  top: 60%;
  -webkit-animation-duration: 6s;
          animation-duration: 6s;
}
.cloud:nth-child(5) {
  top: 20%;
  -webkit-transform: scale(3);
          transform: scale(3);
  -webkit-animation-duration: 4s;
          animation-duration: 4s;
  -webkit-animation-delay: 2s;
          animation-delay: 2s;
}
.cloud:nth-child(6) {
  top: 20%;
  -webkit-transform: scale(2);
          transform: scale(2);
  -webkit-animation-duration: 4s;
          animation-duration: 4s;
}

@-webkit-keyframes leftToRight {
  0% {
    left: -200%;
  }
  100% {
    left: 150%;
  }
}

@keyframes leftToRight {
  0% {
    left: -200%;
  }
  100% {
    left: 150%;
  }
}
@-webkit-keyframes light {
  0% {
    box-shadow: 0 0 0px #5DF254;
  }
  50% {
    box-shadow: 0 0 20px #5DF254;
  }
  80% {
    box-shadow: 0 0 40px rgba(93, 242, 84, 0);
  }
}
@keyframes light {
  0% {
    box-shadow: 0 0 0px #5DF254;
  }
  50% {
    box-shadow: 0 0 20px #5DF254;
  }
  80% {
    box-shadow: 0 0 40px rgba(93, 242, 84, 0);
  }
}