CodePen Embed - CSS only animated rocket

<body>
  <div class="rocket">
    <div class="rocket-body">
      <div class="body"></div>
      <div class="fin fin-left"></div>
      <div class="fin fin-right"></div>
      <div class="window"></div>
    </div>
    <div class="exhaust-flame"></div>
    <ul class="exhaust-fumes">
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
    </ul>
    <ul class="star">
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
      <li></li>
    </ul>
  </div>
</body>

$white: #f5f5f5;
$lightgrey: #dadada;
$midgrey: #b4b2b2;
$darkgrey: #8297aa;
$red: #882121;
$darkred: #882121;
body {
  min-height: 100vh;
  background: $darkgrey;
  overflow: hidden;
}

.rocket {
  position: absolute;
  top: 20%;
  width: 80px;
  left: calc(50% - 60px);
  .rocket-body {
    width: 80px;
    left: calc(50% - 50px);
    animation: bounce 0.5s infinite;
    .body {
      background-color: $lightgrey;
      height: 180px;
      left: calc(50% - 50px);
      border-top-right-radius: 100%;
      border-top-left-radius: 100%;
      border-bottom-left-radius: 50%;
      border-bottom-right-radius: 50%;
      border-top: 5px solid $white;
    }
    &:before {
      content: '';
      position: absolute;
      left: calc(50% - 24px);
      width: 48px;
      height: 13px;
      background-color: $midgrey;
      bottom: -13px;
      border-bottom-right-radius: 60%;
      border-bottom-left-radius: 60%;
    }
  }
  .window {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: 100%;
    background-color: $darkred;
    left: calc(50% - 25px);
    top: 40px;
    border: 5px solid $midgrey;
  }
  .fin {
    position: absolute;
    z-index: -100;
    height: 55px;
    width: 50px;
    background-color: $darkred;
  }
  .fin-left {
    left: -30px;
    top: calc(100% - 55px);
    border-top-left-radius: 80%;
    border-bottom-left-radius: 20%;
  }
  .fin-right {
    right: -30px;
    top: calc(100% - 55px);
    border-top-right-radius: 80%;
    border-bottom-right-radius: 20%;
  }
  .exhaust-flame {
    position: absolute;
    top: 90%;
    width: 28px;
    background: linear-gradient(to bottom, transparent 10%, $white 100%);
    height: 150px;
    left: calc(50% - 14px);
    animation: exhaust 0.2s infinite;
  }
  .exhaust-fumes li {
    width: 60px;
    height: 60px;
    background-color: $white;
    list-style: none;
    position: absolute;
    border-radius: 100%;
    &:first-child {
      width: 200px;
      height: 200px;
      bottom: -300px;
      animation: fumes 5s infinite;
    }
    &:nth-child(2) {
      width: 150px;
      height: 150px;
      left: -120px;
      top: 260px;
      animation: fumes 3.2s infinite;
    }
    &:nth-child(3) {
      width: 120px;
      height: 120px;
      left: -40px;
      top: 330px;
      animation: fumes 3s 1s infinite;
    }
    &:nth-child(4) {
      width: 100px;
      height: 100px;
      left: -170px;
      animation: fumes 4s 2s infinite;
      top: 380px;
    }
    &:nth-child(5) {
      width: 130px;
      height: 130px;
      left: -120px;
      top: 350px;
      animation: fumes 5s infinite;
    }
    &:nth-child(6) {
      width: 200px;
      height: 200px;
      left: -60px;
      top: 280px;
      animation: fumes2 10s infinite;
    }
    &:nth-child(7) {
      width: 100px;
      height: 100px;
      left: -100px;
      top: 320px;
    }
    &:nth-child(8) {
      width: 110px;
      height: 110px;
      left: 70px;
      top: 340px;
    }
    &:nth-child(9) {
      width: 90px;
      height: 90px;
      left: 200px;
      top: 380px;
      animation: fumes 20s infinite;
    }
  }
}

.star li {
  list-style: none;
  position: absolute;
  &:before,
  &:after {
    content: '';
    position: absolute;
    background-color: $white;
  }
  &:before {
    width: 10px;
    height: 2px;
    border-radius: 50%;
  }
  &:after {
    height: 8px;
    width: 2px;
    left: 4px;
    top: -3px;
  }
  &:first-child {
    top: -30px;
    left: -210px;
    animation: twinkle 0.4s infinite;
  }
  &:nth-child(2) {
    top: 0;
    left: 60px;
    animation: twinkle 0.5s infinite;
    &:before {
      height: 1px;
      width: 5px;
    }
    &:after {
      width: 1px;
      height: 5px;
      top: -2px;
      left: 2px;
    }
  }
  &:nth-child(3) {
    left: 120px;
    top: 220px;
    animation: twinkle 1s infinite;
  }
  &:nth-child(4) {
    left: -100px;
    top: 200px;
    animation: twinkle 0.5s ease infinite;
  }
  &:nth-child(5) {
    left: 170px;
    top: 100px;
    animation: twinkle 0.4s ease infinite;
  }
  &:nth-child(6) {
    top: 87px;
    left: -79px;
    animation: twinkle 0.2s infinite;
    &:before {
      height: 1px;
      width: 5px;
    }
    &:after {
      width: 1px;
      height: 5px;
      top: -2px;
      left: 2px;
    }
  }
}

@keyframes fumes {
  50% {
    transform: scale(1.5);
    background-color: transparent;
  }
  51% {
    transform: scale(0.8);
  }
  100% {
    background-color: $white;
    transform: scale(1)
  }
}

@keyframes bounce {
  0% {
    transform: translate3d(0px, 0px, 0);
  }
  50% {
    transform: translate3d(0px, -4px, 0);
  }
  100% {
    transform: translate3d(0px, 0px, 0);
  }
}

@keyframes exhaust {
  0% {
    background: linear-gradient(to bottom, transparent 10%, $white 100%);
  }
  50% {
    background: linear-gradient(to bottom, transparent 8%, $white 100%);
  }
  75% {
    background: linear-gradient(to bottom, transparent 12%, $white 100%);
  }
}

@keyframes fumes2 {
  50% {
    transform: scale(1.1);
  }
}

@keyframes twinkle {
  80% {
    transform: scale(1.1);
    opacity: 0.7;
  }
}

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// css only ;)

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