Javascript Code: Peeping Body

Sometime having an unusual effect in the page would surprise the visitors. The following code previews a head comes out from various edges of the page, peeps, and disappears. It seems interesting!
<!-- this script got from www.javascriptfreecode.com coded by: Kerixa Inc. -->
<style>
body {
  background: #fff;
  font-family: 'Inconsolata', sans-serif;
  line-height: 1.7;
  font-size: 18px;
}

* {
  box-sizing: border-box;
}

strong {
  font-weight: 700;
}

main {
  min-height: 100vh;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
  position: relative;
  padding: 2em;
  text-align: center;
}
main h1, main h3, main p {
  flex: 100%;
  max-width: 600px;
}
main h1 {
  font: 700 40px/1.3 'Inconsolata', monospace;
}
main h3 {
  font: 700 24px/1.3 'Inconsolata', monospace;
  margin: .5em 0 1.8em;
}

a {
  color: #1572b6;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.head {
  position: fixed;
  animation: 50s headpopping infinite;
  top: 0;
  left: 0;
  transform: translateY(-50vh) rotate(180deg);
}

@keyframes headpopping {
  3%, 8% {
    transform: translateY(-50vh) rotate(180deg);
  }
  6% {
    transform: translateY(0) rotate(180deg);
  }
  10% {
    transform: translateY(-50vh) translateX(110vw) rotate(270deg);
  }
  12%, 20% {
    transform: translateY(50vh) translateX(110vw) rotate(270deg);
  }
  15% {
    transform: translateY(50vh) translateX(80vw) rotate(270deg);
  }
  22% {
    transform: translateY(50vh) translateX(110vw) rotate(0);
  }
  24% {
    transform: translateY(110vh) translateX(110vw) rotate(0);
  }
  26%, 30% {
    transform: translateY(110vh) translateX(70vw) rotate(0);
  }
  28% {
    transform: translateY(80vh) translateX(70vw) rotate(0);
  }
  32% {
    transform: translateY(110vh) translateX(70vw) rotate(90deg);
  }
  34% {
    transform: translateY(110vh) translateX(-50vw) rotate(90deg);
  }
  36%, 40% {
    transform: translateY(30vh) translateX(-50vw) rotate(90deg);
  }
  38% {
    transform: translateY(30vh) translateX(0) rotate(90deg);
  }
  42% {
    transform: translateY(-45vh) translateX(-50vw) rotate(230deg);
  }
  44%, 48% {
    transform: translateY(-45vh) translateX(100vw) rotate(230deg);
  }
  46% {
    transform: translateY(-3vh) translateX(85vw) rotate(230deg);
  }
  50% {
    transform: translateY(-45vh) translateX(100vw) rotate(180deg);
  }
  52%, 56% {
    transform: translateY(-45vh) translateX(50vw) rotate(180deg);
  }
  54% {
    transform: translateY(0) translateX(50vw) rotate(180deg);
  }
  58% {
    transform: translateY(-45vh) translateX(-50vw) rotate(0);
  }
  60% {
    transform: translateY(115vh) translateX(-50vw) rotate(0);
  }
  62%, 65% {
    transform: translateY(75vh) translateX(0) rotate(0);
  }
  72% {
    transform: translateY(85vh) translateX(53vw) rotate(0);
  }
  74% {
    transform: translateY(110vh) translateX(53vw) rotate(0);
  }
  76% {
    transform: translateY(110vh) translateX(53vw) rotate(90deg);
  }
  78% {
    transform: translateY(110vh) translateX(-50vw) rotate(90deg);
  }
  80%, 88% {
    transform: translateY(15vh) translateX(-50vw) rotate(90deg);
  }
  82% {
    transform: translateY(15vh) translateX(0) rotate(90deg);
  }
  83% {
    transform: translateY(15vh) translateX(0) rotate(98deg);
  }
  84% {
    transform: translateY(15vh) translateX(0) rotate(83deg);
  }
  85% {
    transform: translateY(15vh) translateX(0) rotate(92deg);
  }
  86% {
    transform: translateY(15vh) translateX(0) rotate(87deg);
  }
  90% {
    transform: translateY(15vh) translateX(-50vw) rotate(180deg);
  }
  92% {
    transform: translateY(-50vh) translateX(-50vw) rotate(180deg);
  }
  94% {
    transform: translateY(-50vh) translateX(0) rotate(180deg);
  }
}
code {
  display: inline-block;
  padding: 1px 7px;
  background: #f1f1f1;
  border-radius: 5px;
}

p {
  margin-bottom: 1.5em;
}

</style>
<img class="head" src="https://www.javascriptfreecode.com/uploads/pictures/chris.png" alt="Spider-Man" />
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