html {
  display: flex;
  justify-content: center;
  background-color: rgba(241, 255, 47, 0.2);
  text-align: center;
  justify-content: center;
  font-family: monospace;
}

h1 {
  font-size: 500%;
  color: darkgoldenrod;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -100px;
  margin-left: -250px;
}

h1:hover{
    text-shadow: 0 0 0.1em #fff, 0 0 0.2em #fff, 0 0 0.3em #fff, 0 0 0.4em rgb(252, 249, 95),0 0 0.6em rgb(232, 229, 54), 0 0 0.8em rgb(241, 235, 47), 0 0 1.0em rgb(235, 213, 16), 0 0 1.2em rgb(255, 234, 0);
}

h1 {
  animation: createBox 1.5s alternate infinite;
}
@keyframes createBox {
  from {
    transform: scale(0.6);
    opacity: 20%;
  }
  to {
    transform: scale(1.5);
    opacity: 100%;
  }
}