Animated ghosts logo - https://www.shopify.com/partners/blog/7-ways-to-spice-up-your-website-for-halloween

halloween-animation.css

.halloween-animation {
  position: relative;
  display: inline-block;
}

.halloween-animation::before,
.halloween-animation::after {
  display: block;
  content: '';
  height: 20px;
  width: 15px;
  position: absolute;
  opacity: 0;
  transition: all 250ms ease-in-out;
}

.halloween-animation:hover::before, .halloween-animation:hover::after {
  opacity: 1;
}

.halloween-animation:hover::before {
  /* to avoid transition jank in chrome make sure transitions don't include transform */
  height: 46px;
  width: 34px;
  right: -40px;
  animation: float-right 3s ease-in-out infinite;
}

.halloween-animation:hover::after {
  height: 40px;
  width: 30px;
  top: -45px;
  transform: rotate(-10deg);
  animation: float-top 3s ease-in-out infinite;
}

@keyframes float-right {
  50% {
    transform: rotate(10deg) translate(0, -15px);
  }
}
@keyframes float-top {
  50% {
    transform: rotate(-5deg) translate(0, 10px);
  }
}

/* right ghost */
.halloween-animation::before {
  right: 0;
  bottom: 0;
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}

/* left ghost */
.halloween-animation::after {
  top: 0;
  left: 50%;
  background: url('data:image/svg+xml;charset=UTF8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="12 15 713 940"><path fill="%23FFF" fill-rule="evenodd" d="M512.55 45.45c14.42 6.64 28.84 13.35 42.37 21.69 17.15 10 32.91 22.12 48.31 34.61 27.61 23.92 51.72 51.98 70.75 83.19 19.39 31.72 33.49 66.66 41.57 102.95 5.04 22.35 7.3 45.24 8.15 68.1-.06 151.66-.01 303.32-.02 454.98.1 5.63-.24 11.27.17 16.9 1.29 8.02-.66 16.07-2.1 23.93-8.22 38.75-34.91 73.24-70.8 90.14-22.36 11.06-48.14 15.17-72.84 11.85-25.79-2.59-50.28-14.23-69.78-31.12-12.09-9.98-21.62-22.77-29.05-36.51-19.52 36.18-57.22 62.02-98.14 66.54-6.69 1.07-13.47.44-20.2 1.02-22.82-.88-45.64-7.33-64.87-19.84-18.49-11.41-34.1-27.58-44.57-46.64-23.14 36.72-65.92 60.8-109.52 59.61-21.45.77 47.22-5.13 28.34-15.07-27.88-15.08-50.21-40.37-60.96-70.26-2.19-7.44-5.05-14.75-6.32-22.41-.1-108.03-.01-216.07-.04-324.1-.08-53.67.17-107.35-.17-161.02.45-20.26 2.6-40.49 6.65-60.35 3.26-16.5 8.28-32.61 13.69-48.51 21.75-59.51 60.55-112.51 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}