.holo{position:relative;display:grid;place-items:center;padding:40px 0 56px;
  perspective:900px}
.holo img{width:250px;height:250px;
  filter:drop-shadow(0 0 22px rgba(48,176,208,.35));
  animation:holo-drift 7s ease-in-out infinite alternate}
@keyframes holo-drift{from{transform:translateY(0)}to{transform:translateY(-9px)}}
.holo::after{content:"";position:absolute;left:50%;bottom:14px;width:56%;height:18px;
  transform:translateX(-50%);border-radius:50%;
  background:radial-gradient(ellipse at center,rgba(48,176,208,.18),transparent 72%);
  filter:blur(5px)}