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HTML 

              
                <div class="container">

  <!-- Background -->
  <div class="moon"></div>
  <div class="clouds cloud1">
    <div></div>
    <div></div>
  </div>
  <div class="clouds cloud2">
    <div></div>
    <div></div>
  </div>
  <div class="clouds cloud3">
    <div></div>
    <div></div>
  </div>
  <div class="clouds cloud4">
    <div></div>
    <div></div>
  </div>
  <div class="clouds cloud5">
    <div></div>
    <div></div>
  </div>

  <div class="smoke">
    <div></div>
  </div>

  <div class="tree tree1"></div>
  <div class="tree tree2"></div>
  <div class="tree tree3"></div>
  <div class="tree tree4"></div>
  <div class="tree tree5"></div>

  <!-- Lantern Garland -->
  <div class="dancing-line">

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="rounded-eyes"></div>
      <div class="rounded-eyes"></div>
      <div class="mean-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="eye"></div>
      <div class="eye eye-right"></div>
      <div class="bb-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="rounded-eyes baby-eyes"></div>
      <div class="rounded-eyes baby-eyes"></div>
      <div class="mean-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="rounded-eyes"></div>
      <div class="rounded-eyes"></div>
      <div class="rounded-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="eye"></div>
      <div class="eye eye-right"></div>
      <div class="bb-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="rounded-eyes"></div>
      <div class="rounded-eyes"></div>
      <div class="mean-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="eye"></div>
      <div class="eye eye-right"></div>
      <div class="bb-mouth"></div>
    </div>

    <div class="pumpkin">
      <div class="stem"></div>
      <div class="heart"></div>
      <div class="rounded-eyes baby-eyes"></div>
      <div class="rounded-eyes baby-eyes"></div>
      <div class="mean-mouth"></div>
    </div>

  </div>
</div>
!

CSS 

              
                /* Global */
body {
  margin: 0;
  height: 100vh;
  background: radial-gradient(
    ellipse at center,
    #160909 0%,
    #05060f 45%,
    #0d0b30 100%
  );
  box-sizing: border-box;
  overflow: hidden;
}

.container {
  width: 100vw;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* Sky */
.moon {
  position: absolute;
  top: -50px;
  left: 65%;
  z-index: -1;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: #f2f2ea;
  box-shadow: 0px -6px 36px 0px #fbeb36, 0px 0px 16px 0px #ffb347;
  filter: blur(1px);
}

.clouds {
  position: absolute;
  top: 4%;
  left: -15%;
  width: 380px;
  height: 10px;
  background: #f2f2ea;
  box-shadow: 0px -6px 36px 0px #f2f2ea;
  filter: blur(20px);
  opacity: 0.6;
  animation: fly 25s linear 0s infinite;
}
.cloud2 {
  left: 20%;
  top: 10%;
  width: 80px;
}
.cloud3 {
  left: 40%;
  top: 34%;
  height: 8px;
  box-shadow: 0px -6px 36px 0px #f2f2ea;
}
.cloud4 {
  left: 60%;
  top: 16%;
  width: 80px;
}
.cloud5 {
  left: 80%;
  top: 40%;
  height: 5px;
  width: 120px;
}
.clouds div {
  position: absolute;
  top: -2px;
  left: 100px;
  width: 80px;
  height: 30px;
  background: #f2f2ea;
  box-shadow: 0px -6px 36px 0px #f2f2ea;
  filter: blur(30px);
}
.clouds div:nth-child(2) {
  top: 30px;
  left: 180px;
  width: 120px;
  height: 20px;
}

/* Smoke */
.smoke {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 180px;
  height: 20px;
  box-shadow: 0px -6px 36px 0px #d2c7d0;
  filter: blur(20px);
  opacity: 0.6;
  animation: smoke 25s linear 0s infinite;
  transform: scale(2);
}
.smoke div {
  position: absolute;
  top: -20px;
  left: 100px;
  width: 180px;
  height: 20px;
  background: #d2c7d0;
  box-shadow: 0px -6px 36px 0px #d2c7d0;
  filter: blur(30px);
}

/* Forest Background */
.tree {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 400px;
  height: 80vh;
  background: black;
  transform: scale(2);
  clip-path: polygon(
    0% 97%,
    3% 82%,
    7% 73%,
    12% 49%,
    19% 23%,
    23% 15%,
    21% 10%,
    25% 15%,
    33% 15%,
    25% 18%,
    21% 25%,
    22% 32%,
    29% 31%,
    28% 36%,
    23% 38%,
    17% 46%,
    20% 50%,
    37% 49%,
    53% 44%,
    61% 38%,
    63% 32%,
    60% 23%,
    61% 20%,
    62% 26%,
    64% 30%,
    65% 22%,
    71% 16%,
    70% 19%,
    68% 24%,
    67% 29%,
    71% 28%,
    67% 31%,
    64% 38%,
    70% 38%,
    76% 32%,
    87% 25%,
    93% 25%,
    90% 28%,
    84% 29%,
    79% 33%,
    85% 34%,
    82% 36%,
    75% 36%,
    74% 42%,
    80% 43%,
    80% 47%,
    75% 46%,
    70% 44%,
    62% 42%,
    56% 47%,
    55% 49%,
    48% 51%,
    56% 54%,
    66% 59%,
    71% 63%,
    76% 60%,
    79% 59%,
    80% 62%,
    76% 64%,
    75% 70%,
    73% 73%,
    73% 68%,
    67% 64%,
    56% 60%,
    48% 56%,
    40% 55%,
    34% 55%,
    23% 57%,
    20% 64%,
    17% 70%,
    17% 79%,
    12% 83%,
    15% 97%
  );
}
.tree2 {
  background: #0d0b30;
  transform: rotate(-30deg);
}
.tree3 {
  transform: rotate(-20deg);
  transform: scale(3);
  top: 225px;
  left: 300px;
}
.tree4 {
  left: 600px;
  top: 200px;
  transform: scaleX(-1);
  background: #0d0b30;
}
.tree5 {
  left: 1260px;
  top: 50px;
  transform: scale(3);
}

/* Line */
.dancing-line {
  background: red;
  border-top: 2px solid #8c5407;
  width: 100%;
  position: relative;
  transform: rotateZ(-10deg);
}

.stem {
  position: absolute;
  top: -14px;
  left: 45px;
  width: 6px;
  height: 24px;
  border-radius: 1px;
  background-color: #194d14;
  background-image: linear-gradient(
    to right,
    rgba(0, 0, 0, 0.3) 0%,
    rgba(0, 0, 0, 0.1) 58%,
    rgba(0, 0, 0, 0.1) 62%,
    rgba(0, 0, 0, 0.3) 100%
  );
}

/* Pumkin body */
.pumpkin {
  position: absolute;
  top: 10px;
  left: 0;
  width: 110px;
  height: 100px;
  border-radius: 46px;
  background: #e02604;
  transform: rotateZ(8deg);
  transform-origin: 50% 0;
  box-shadow: inset 0 0px 20px #964203, 0 0 30px 2px #d23805,
    0px 7px 14px #862400, 0px 3px 4px #ffc039 inset, 0px 0px 0px #f59201 inset,
    0px 12px 19px 10px #862400 inset;
}
.pumpkin::before {
  content: "";
  position: absolute;
  width: 90px;
  height: 100px;
  left: -10px;
  border-radius: 50px;
  background: #e02604;
  box-shadow: inset 0 0px 20px #964203, 0 0 20px 2px #d23805,
    0px 7px 14px #862400, 0px 3px 4px #ffc039 inset, 0px 0px 0px #f59201 inset,
    0px 12px 19px 10px #862400 inset;
}
.pumpkin::after {
  content: "";
  position: absolute;
  width: 90px;
  height: 100px;
  left: 5px;
  border-radius: 50px;
  background: #e02604;
  box-shadow: inset 0 0px 20px #964203, 0px 7px 14px #862400,
    0px 3px 4px #ffc039 inset, 0px 0px 0px #f59201 inset,
    0px 12px 19px 10px #862400 inset;
}
.heart {
  position: absolute;
  top: 0;
  left: 30px;
  z-index: 3;
  width: 38px;
  height: 100px;
  border-radius: 50%;
  background: #e02604;
  box-shadow: inset 0 0px 20px #964203, 0px 7px 14px #862400,
    0px 3px 4px #ffc039 inset, 0px 0px 0px #f59201 inset,
    0px 12px 18px 10px #862400 inset;
}
/* Eyes */
.eye {
  position: absolute;
  top: 25px;
  left: 20px;
  height: 22px;
  width: 22px;
  z-index: 1000;
  background-color: orange;
  box-shadow: inset 15px 0 8px black;
  border: 2px solid red;
  clip-path: polygon(0% 98%, 100% 99%, 52.9% 4.9%);
}
.eye-right {
  left: 60px;
}

.rounded-eyes {
  position: absolute;
  z-index: 10;
  top: 105px;
  left: 20px;
}
.rounded-eyes:before,
.rounded-eyes:after {
  content: "";
  position: absolute;
  width: 26px;
  height: 32px;
  background-color: orange;
  box-shadow: inset 1px 0 2px black, inset 20px 0 16px black,
    0px -4px 2px #ff5722 inset, 0px -2px 3px 2px #862400;
  border-bottom: 2px solid #ff5722;
  border-radius: 30% 70% 70% 30% / 30% 30% 70% 70%;
}
.rounded-eyes:before {
  top: -80px;
  left: -5px;
  transform: rotate(20deg);
}
.rounded-eyes:after {
  top: -80px;
  left: 50px;
  transform: rotate(-20deg);
}

.baby-eyes:before,
.baby-eyes:after {
  width: 16px;
  height: 16px;
  top: -70px;
}
/* Mouth */
.mean-mouth {
  position: absolute;
  width: 100%;
  height: 100px;
  left: 0px;
  top: 4px;
  z-index: 10;
  background: black;
  clip-path: polygon(
    14% 64%,
    25% 79%,
    32% 74%,
    41% 89%,
    50% 80%,
    54% 87%,
    60% 78%,
    66% 83%,
    73% 72%,
    78% 78%,
    88% 57%,
    78% 69%,
    73% 66%,
    66% 76%,
    59% 69%,
    54% 77%,
    47% 69%,
    43% 76%,
    34% 64%,
    26% 70%
  );
}
.rounded-mouth {
  position: absolute;
  width: 100px;
  height: 60px;
  left: 4px;
  top: 30px;
  background: black;
  z-index: 10;
  clip-path: polygon(
    10% 75%,
    25% 90%,
    40% 95%,
    60% 95%,
    75% 91%,
    90% 75%,
    62% 88%,
    37% 88%
  );
  filter: drop-shadow(20px 20px 80px orange);
}
.bb-mouth {
  position: absolute;
  width: 60px;
  height: 14px;
  left: 20px;
  top: 60px;
  z-index: 10;
  border-left: 0 solid transparent;
  border-right: 0 solid transparent;
  border-bottom: 10px solid black;
  -moz-border-radius: 50%;
  -webkit-border-radius: 50%;
  border-radius: 50%;
}
.bb-mouth:before {
  content: "";
  display: block;
  height: 6px;
  width: 8px;
  background-color: orange;
  position: absolute;
  left: 20px;
  top: 18px;
}
.bb-mouth:after {
  content: "";
  display: block;
  height: 6px;
  width: 8px;
  background-color: orange;
  position: absolute;
  left: 32px;
  top: 18px;
}
/* Specific to each lantern */
.pumpkin:nth-child(1) {
  animation: swing 0.8s ease-in-out forwards infinite;
}
.pumpkin:nth-child(2) {
  left: 200px;
  animation: swing 1s ease-in-out forwards infinite;
}
.pumpkin:nth-child(3) {
  left: 360px;
  animation: swing 1.6s ease-in-out forwards infinite;
}
.pumpkin:nth-child(4) {
  left: 600px;
  animation: swing 1s ease-in-out forwards infinite;
}
.pumpkin:nth-child(5) {
  left: 900px;
  animation: swing 1.2s ease-in-out forwards infinite;
}
.pumpkin:nth-child(6) {
  left: 1100px;
  animation: swing 1.6s ease-in-out forwards infinite;
}
.pumpkin:nth-child(7) {
  left: 1440px;
  animation: swing 1s ease-in-out forwards infinite;
}
.pumpkin:nth-child(8) {
  left: 1600px;
  animation: swing 1.3s ease-in-out forwards infinite;
}

/* Animations */
@keyframes swing {
  0% {
    transform: rotate(10deg);
  }
  50% {
    transform: rotate(-5deg);
  }
  100% {
    transform: rotate(10deg);
  }
}

@keyframes fly {
  0% {
    transform: translateX(-100vw);
  }
  100% {
    transform: translateX(100vw);
  }
}

@keyframes smoke {
  0% {
    transform: translateX(100vw);
  }
  100% {
    transform: translateX(-100vw);
  }
}
!

JS 

              
                // Playing with box-shadow and clip-path in order to create an "Halloween Atmosphere" for the CodePenChallenge Pumpkins
!
999px

Console