html,
body {
  margin: 0;
  padding: 0;
  height: 100vh;
  background: #fff;
}

main {
  position: relative;
  display: grid;
  place-items: center;
  height: 100vh;
  z-index: 2;
}

main div {
  border-radius: 50%;
  overflow: hidden;
  animation: vibrate 2s infinite alternate;
  border: 15px solid #222;
}

main div img {
  width: 240px;
  display: block;
  animation: vibrate 2s infinite alternate 100ms;
}

.bg {
  position: fixed;
  width: 100vw;
  height: 100vh;
  top: -50vh;
  left: -50vw;
  z-index: 1;
}

.bg img {
  position: relative;
  object-fit: contain;
  display: block;
  width: 200%;
  height: 200%;
}

@keyframes vibrate {
  from {
    transform: scale(1);
  }

  to {
    transform: scale(1.1);
  }
}