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              <div><h1>江戸を東京と改称する構想は、江戸時代後期の経世家である佐藤信淵が文政6年(1823年)に著した『混同秘策』にすでに現れていた。</h1></div>
            
          
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              body {
  width: 100%;
  height: 100%;
  margin: 0;
  background: #282828;
}
div {

  width: 20%;
  height: auto;
  margin: auto;
  background-color: #21d4fd;
margin-top:20px;
  border-radius: 30% 70% 70% 30%/30% 30% 70% 70%;
  box-shadow: 15px 15px 50px rgba(0,0,0,0.2);
  animation: morphing 10s infinite;
  overflow: hidden;
}
div:hover {
  animation-play-state: paused;
}
div h1 {
  color: #fff;
  font-size: 15px;
  margin: auto;
}

@keyframes morphing {
  0% {
    border-radius: 30% 70% 70% 30%/30% 30% 70% 70%;
    box-shadow: 15px 15px 50px rgba(0,0,0,0.2);
  }
  25% {
    border-radius: 58% 42% 75% 25%/76% 46% 54% 24%;
  }
  50% {
    border-radius: 50% 50% 33% 67%/55% 27% 73% 45%;
    box-shadow: -10px -5px 50px rgba(0,0,0,0.2);
  }
  75% {
    border-radius: 33% 67% 58% 42%/63% 68% 32% 37%;
  }
}

            
          
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999px
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