.img_box{
  animation: img_box_9955 3s linear infinite;
  transform-origin: 50% 50%;
  margin: 1rem 0 !important;
}

@keyframes img_box_9955 {
  0% { transform: translateY(0) }
  33.33333% { transform: translateY(-10px) }
  66.66667% { transform: translateY(0) }
  100% { transform: translateY(0) }
}