body {
    background-color:black;
    display:block;
    }
  
 



/*Animated Button*/
.butani {
    background-color: #3399ff; 
    color: #ffffff; 
    font-size: 16px; 
    padding: 10px 20px; 
    border-radius: 5px; 
    border: none;
  -webkit-animation: butani-animation 2s linear;
-moz-animation: butani-animation 2s linear;
-ms-animation: butani-animation 2s linear;
-o-animation: butani-animation 2s linear;
  animation: butani-animation 2s linear;
  animation-iteration-count: infinite; 
}

/*Keyframes*/
@keyframes butani-animation {
 0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.2);
  }
  100% {
    transform: scale(1);
  }
}