.ball {
 position: relative;
 height: 15px;
 width: 15px;
 background-color: rgb(255, 44, 44);
 border-radius: 50%;
 animation: bounce 0.5s ease-in-out infinite both;
}

@keyframes bounce {
 0%, 100% {
  transform: translate(0px, 0px);
 }

 50% {
  transform: translate(0px, 50px) scale(1, 0.77);
 }
}