$size: 80px;
$space: 60px;

body {
  background: #000;
  overflow: hidden;
  height: 100vh;
}

.container {
  width: 200px;
  height: 200px;
  margin: 0px auto;
  margin-top: 10%;
}

.ball {
  width: 0.6*$size;
  height: $size;
  border-radius: 3px;
  margin: 0px auto;
  background: yellow;
  -webkit-animation: CURL 50s infinite;
  animation: CURL 50s infinite;
}

@-webkit-keyframes CURL {
  0%, 100% {
    transform: translate(0,2*$space) rotate(120deg) scale(1);
  }
  10%, 60%, 80% {
    transform: translate(0,1.4*$space) rotate(90deg) scale(1);
    /* border-radius: 10px; */
  }
   20%, 50% {
    transform: translate(0,1.6*$space) rotate(72deg) scale(1);
  }
  
   30%, 70% {
    transform: translate(2*$space, 2*$space) rotate(60deg) scale(1);
  }
  
   40%, 90% {
    transform: translate(2*$space,2*$space) rotate(45deg);
  }
}

@keyframes CURL {
  0%, 100% {
    transform: translate(0,2*$space) rotate(120deg) scale(1);
  }
  10%, 60%, 80% {
    transform: translate(0,1.4*$space) rotate(90deg) scale(1);
    /* border-radius: 10px; */
  }
   20%, 50% {
    transform: translate(0,1.6*$space) rotate(72deg) scale(1);
  }
  
   30%, 70% {
    transform: translate(2*$space, 2*$space) rotate(60deg) scale(1);
  }
  
   40%, 90% {
    transform: translate(2*$space,2*$space) rotate(45deg);
  }
}