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HTML

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CSS

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CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML 

              
                <div class="ufo">
  <div class="monster" style="color: #7cb342">
    <div class="body">
      <div class="ear"></div>
      <div class="ear"></div>
      <div class="vampi-mouth">
        <div class="vampi-tooth"></div>
      </div>
    </div>
    <div class="eyes">
      <div class="eye">
        <div class="pupil"></div>
      </div>
    </div>
  </div>
  <div class="ship">
    <div class="glass"></div>
    <div class="base">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
    </div>
  </div>
</div>
!

CSS 

              
                .ufo {
  font-size: 25vmin;
  position:relative;
}

.ship {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.glass {
  width: 2.65em;
  height: 1.5em;
  opacity:0.9;
  margin:auto;
  border-top-left-radius: 4em;
  border-top-right-radius: 4em;
  box-shadow:inset 0px 20px 65px -10px rgba(255, 255, 255, 0.79);
}

.base {
  width:3.25em;
  height:0.3em;
  border-radius:200px;
  margin:auto;
  background:#2196f3;
  padding-left: 20px;
  padding-right: 20px;
  border-top:3px solid rgba(255, 255, 255, 0.17);
  border-bottom:10px solid rgba(0, 0, 0, 0.09);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.base span {
  width:14px;
  height:14px;
  border-radius:50%;
  border:2px solid #555;
  background:#eadc8a;
  margin-top:7px;
}

.monster {
  font-size: 0.7em;
  margin: 0 auto;
  width: 1em;
  height: 1.3em;
  border-radius: 0.5em 0.5em 0em 0em / 0.6em 0.6em 0em 0em;
  box-sizing: content-box;
  border: 0.07em solid transparent;
  position: relative;
  user-select: none;
  cursor: move;
  cursor: -moz-grab;
  cursor: -webkit-grab;
  cursor: grab;
}

.monster.small {
  font-size: 4rem;
}

.body {
  width: 100%;
  height: 100%;
  background-color: currentColor;
  border-radius: inherit;
  position: relative;
  transform-origin: bottom center;
  animation: bouncebody alternate infinite 400ms 40ms ease-in-out;
}

.eyes {
  text-align: center;
  display: flex;
  font-size: 0.65em;
  width: 1em;
  height: 1em;
  position: absolute;
  left: 0.25em;
  top: 0.3em;
  animation: bounce alternate infinite 400ms ease-in-out;
}

.eye {
  display: inline-block;
  overflow: hidden;
  position: relative;
  width: 100%;
  height: 100%;
  background-color: white;
  border-radius: 0.5em 0.5em 0.5em 0.5em / 0.6em 0.6em 0.4em 0.4em;
  box-shadow: 0.03em 0.14em rgba(0,0,0,0.1);
  animation: blink forwards infinite 10s ease-in-out;
}

.eye:nth-last-child(n+2),
.eye:nth-last-child(n+2) ~ .eye {
  width: 1em;
  height: 1em;
  font-size: 0.5em;
}

.pupil {
  --pupil-size: 0.6em;
  position: absolute;
  content: ' ';
  width: var(--pupil-size);
  height: var(--pupil-size);
  border-radius: 50%;
  background-color: black;
  box-sizing: border-box;
  transform: translateX(calc(0.5 * 0.3em + 0.05em)) translateY(calc(0.5 * 0.3em + 0.05em));
}

.pupil::before {
  content: ' ';
  width: 0.25em;
  height: 0.25em;
  transform: translateX(-0.05em);
  background-color: white;
  display: block;
  border-radius: 50%;
}

.mouth {
  font-size: 0.2em;
  width: 1em;
  height: 0.3em;
  background: black;
  border-radius: 1.5em 1.5em 0.5em 0.5em;
  position: absolute;
  bottom: 0.8em;
  left: 50%;
  transform: translateX(-50%);
}

.mouth::before {
  width: 50%;
  height: 30%;
  display: block;
  content: ' ';
  background-color: #ff8800;
  border-radius: 50% / 100% 100% 50% 50%;
  position:absolute;
  top: 50%;
  left: 50%;
  transform: translateY(-10%) translateX(-50%);
}

.vampi-mouth {
  position: absolute;
  background: black;
  overflow: hidden;
  font-size: 0.3em;
  width: 1em;
  height: 0.7em;
  left: 50%;
  bottom: 0.3em;
  transform: translateX(-50%);
  border-radius: 0.7em 0.7em 1.2em 1.2em;
}

.vampi-mouth::before {
  content: '';
  display: block;
  background: #ff8800;
  width: 100%;
  height: 0.2em;
  position: absolute;
  bottom: 0;
  border-radius: 50% 50% 0 0;
}

.vampi-tooth::before,
.vampi-tooth::after,
.vampi-tooth {
  --teeth-size: 0.25em;
  display: block;
  width: 0;
  height: 0;
  font-size: inherit;
  border-left: calc(var(--teeth-size) / 2) solid transparent;
  border-right: calc(var(--teeth-size) / 2) solid transparent;
  border-top: var(--teeth-size) solid #fff;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

.vampi-tooth:before {
  content: '';
  transform: translateX(-150%) translateY(-100%);
}

.vampi-tooth:after {
  content: '';
  transform: translateX(50%) translateY(-100%);
}

.ear {
  position: absolute;
  top: -1.2em;
  transform-origin: bottom center;
  font-size: 0.3em;
  width: .8em;
  height: 1.5em;
  left: 18%;
  transform: rotate(-10deg);
  animation: antena_e 5s infinite;
}

.ear + .ear {
  left: auto;
  right: 18%;
  transform: rotate(10deg);
  animation: antena_d 5s infinite;
}

.ear:before {
  content: '';
  display: block;
  width: .8em;
  height: .8em;
  position: absolute;
  z-index: 2;
  left: 0;
  border-radius: 50%;
  background: currentColor;
  box-shadow: inset -.1em -.08em rgba(0,0,0,.1);
}

.ear:after {
  content: '';
  display: block;
  width: 0.3em;
  height: 100%;
  position: absolute;
  top: .2em;
  left: .3em;
  background: currentColor;
}



@keyframes blink {
  0%, 2%, 60%, 62%, 100% { transform: scaleX(1) scaleY(1); } 
  1%, 61% { transform: scaleX(1.3) scaleY(0.1); } 
}

@keyframes bounce { 
  to { transform: translateY(4%); } 
}

@keyframes bouncebody { 
  to { transform: scaleX(1.03) scaleY(0.97); } 
}

@keyframes antena_d { 50% {transform: rotate(20deg);} }
@keyframes antena_e { 50% {transform: rotate(-20deg);} }
!

JS
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