.container
  .whaleContainer
    - for(var x = 1; x <= 4; x++)
      .whalePos(class="size" + x)
        .whaleRotate(class="size" + x)
          .whale
          .fin
  .cPos
    .cc
      .circle.one
      .circle.two
      .circle.three
      .circle.four
  .triangleContainer
    .triangleBar
    - for(var x = 1; x < 20; x++)
      span(class="triangle")
  .gradientContainer
    .overlay.one
    .gradient
      - for(var x = 1; x < 39; x++)
        span(class="ray" + x)
      - for(var x = 1; x < 39; x++)
        span(class="ray" + x)
  .rocks
    .rock.one
    .rock.two
    .rock.three
    .rock.four
  .bubbleContainer
    - for(var x = 1; x < 50; x++)
      span(class="bubbleY" + x)
        span(class="bubbleX" + x)


      
View Compiled
$rayHeight: 400px;
$teal1: #AFE0E4;
$teal2: #C0E6E9;
$teal3: #84CDD4;
$teal4: #7EC9D1;
$teal5: #97D6DC;
$teal6: #AEDEE2;
$teal7: #96D3D8;
$teal8: #9CD7DD;
$teal9: #7ECBD3;
$teal10: #AFE0E4;
$teal11: #B6DFE3;
$teal12: #84CDD4;

.container {
  position: relative;
  width: 160px;
  height: 335px;
  background: linear-gradient(to bottom, #96C7CC 0%, #C3DDD8 30%, #C3DDD8 100%);
  border-radius: 100px;
  overflow: hidden;
}

.gradientContainer {
  // border: 1px solid #ff9900;
  margin-top: 95px;
  height: 300px;
  overflow:hidden;
  background: linear-gradient(to bottom, #C3E5E5, #0D3F53);
  position: absolute;
  z-index: 200;
}
.overlay {
  width: 100%;
  height: 240px;
  position: absolute;
  &.one {
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 10%, #0B4558 100%);
    z-index: 100;
  }
}
.gradient {
  margin-top: -100px;
  // border: 1px solid red;
  width: 620px;
  height: 400px;
  transform: translateX(-50px) rotate(20deg);
  animation-name: gradient;
  animation-duration: 10s;
  animation-iteration-count: infinite;
  animation-fill-mode: forwards;
  animation-timing-function: linear;
  transform-style: preserve-3d;
}

@keyframes gradient {
  0% {
    transform: translateX(-50px) rotate(20deg);
  }
  100% {
    transform: translateX(-379px) rotate(20deg);
  }
}

@for $i from 1 through 26 {
  .ray#{$i} {
    height: $rayHeight;
    display: inline-block;
    animation-name: blinkRay;
    animation-duration: random(4) + s;
    animation-delay: random(4) + s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-timing-function: linear;
    opacity: 1;
  }
}

@keyframes blinkRay {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0.4;
  }
}

.ray1, .ray14, .ray27 { width: 20px; background: linear-gradient(to bottom, $teal1 0%, $teal1 40%, rgba(255, 255, 255,0) 100%); }
.ray2, .ray15, .ray28 { width: 20px; background: linear-gradient(to bottom, $teal2 0%, $teal2 30%, rgba(255, 255, 255,0) 100%); }
.ray3, .ray16, .ray29 { width: 15px; background: linear-gradient(to bottom, $teal3 0%, $teal3 20%, rgba(255, 255, 255,0) 100%); }
.ray4, .ray17, .ray30 { width: 5px; background: linear-gradient(to bottom, $teal4 0%, $teal4 10%, rgba(255, 255, 255,0) 100%); }
.ray5, .ray18, .ray31 { width: 10px; background: linear-gradient(to bottom, $teal5 0%, $teal5 40%, rgba(255, 255, 255,0) 100%); }
.ray6, .ray19, .ray32 { width: 10px; background: linear-gradient(to bottom, $teal6 0%, $teal6 30%, rgba(255, 255, 255,0) 100%); }
.ray7, .ray20, .ray33 { width: 10px; background: linear-gradient(to bottom, $teal7 0%, $teal7 20%, rgba(255, 255, 255,0) 100%); }
.ray8, .ray21, .ray34 { width: 5px; background: linear-gradient(to bottom, $teal8 0%, $teal8 40%, rgba(255, 255, 255,0) 100%); }
.ray9, .ray22, .ray35 { width: 25px; background: linear-gradient(to bottom, $teal9 0%, $teal9 60%, rgba(255, 255, 255,0) 100%); }
.ray10, .ray23, .ray36 { width: 10px; background: linear-gradient(to bottom, $teal5 0%, $teal5 50%, rgba(255, 255, 255,0) 100%); }
.ray11, .ray24, .ray37 { width: 10px; background: linear-gradient(to bottom, $teal6 0%, $teal6 40%, rgba(255, 255, 255,0) 100%); }
.ray12, .ray25, .ray38 { width: 10px; background: linear-gradient(to bottom, $teal7 0%, $teal7 20%, rgba(255, 255, 255,0) 100%); }
.ray13, .ray26, .ray39 { width: 5px; background: linear-gradient(to bottom, $teal8 0%, $teal8 10%, rgba(255, 255, 255,0) 100%); }

.cPos {
  position: relative;
  top: 30%;
  left: calc(50% - 80px);
  z-index: 9;
  transform: translateY(0) scale(1);
  animation-name: sunset;
  animation-duration: 10s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function: linear;
}

@keyframes sunset {
  0% {
    transform: translateY(0) scale(1);
  }
  100% {
    transform: translateY(10px) scale(.9);
  }
}
.cc {
  display: flex;
  align-items: center;
  justify-content: center;
}
.circle {
  position: absolute;
  background: #FBFEF9;
  border-radius: 50%;
  &.one {
    width: 160px;
    height: 160px;
    opacity: .2;
  }
  &.two {
    width: 130px;
    height: 130px;
    opacity: .2;
  }
  &.three {
    width: 100px;
    height: 100px;
    opacity: .2;
  }
  &.four {
    width: 70px;
    height: 70px;
  }
}

.rocks {
  position: relative;
  z-index: 2000;
  .rock {
    position: absolute;
    &.one {
      top: 280px;
      left: -30px;
      width: 98px;
      height: 50px;
      clip-path: polygon(0 0, 56% 10%, 80% 100%, 0% 100%);
      background: #02364B;
      z-index: 2000;
    }
    &.two {
      top: 295px;
      left: 30px;
      width: 95px;
      height: 60px;
      clip-path: polygon(0 15%, 20% 10%, 100% 70%, 100% 100%, 0% 100%);
      background: #063B51;
      z-index: 1000;
    }
    &.three {
      top: 300px;
      left: 50px;
      width: 95px;
      height: 60px;
      clip-path: polygon(0 60%, 60% 20%, 100% 12%, 100% 100%, 0 100%);
      background: #002C44;
      z-index: 3000;
    }
    &.four {
      top: 255px;
      left: 125px;
      width: 60px;
      height: 65px;
      clip-path: polygon(0 100%, 20% 45%, 100% 12%, 100% 100%, 0 100%);
      background: #023A51;
      z-index: 4000;
    }
  }
}

.bubbleContainer {
  width: 100%;
  height: 100px;
  bottom: 0;
  position: absolute;
  animation-name: bubblesIn;
  animation-duration: 2s;
  animation-iteration-count: 1;
  animation-timing-function: linear;
}

@keyframes bubblesIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@for $i from 1 through 10 {
  $size: random(4) + 1 + px;

  .bubbleX#{$i} {
    display: inline-block;
    width: $size;
    height: $size;
    border-radius: 50%;
    background: #FFF;
    transform: translateX(0);
    animation-name: bubbleX#{$i};
    animation-duration: 4s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
  }
  .bubbleY#{$i} {
    display: inline-block;
    position: absolute;
    z-index: 5000;
    top: random(100) + px;
    left: random(156) + px;
    animation-name: bubbleY;
    animation-duration: 1.25s;
    animation-iteration-count: infinite;
    animation-timing-function: linear;
    transform: translateY(0);
    opacity: .6;
    animation-delay: random(3) + s;
  }
  @keyframes bubbleX#{$i} {
    0% { transform: translateX(0); }
    20% { transform: translateX(-random(15) + px) }
    40% { transform: translateX(random(15) + px) }
    60% { transform: translateX(-random(15) + px) }
    80% { transform: translateX(random(15) + px) }
    100% { transform: translateX(-random(15) + px); }
  }
  
  @keyframes bubbleY {
    0% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-30px);
    }
    100% {
      transform: translateY(-60px);
      opacity: 0;
    }
  }
}

.triangleContainer {
  margin-top: 92px;
  width: 1000px;
  position: absolute;
  z-index: 1000;
  transform: translateX(-250px);
  animation-name: triangles;
  animation-duration: 5s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}
.triangleBar {
  width: 1000px;
  height: 6px;
  position: absolute;
  z-index: 1500;
  background: linear-gradient(to bottom, #E7F9F3, #F5FFF9);
}
.triangle {
  width: 50px;
  height: 10px;
  display: inline-block;
  background: #EDF7E7;
  clip-path: polygon(0% 0%, 100% 0%, 50% 100%, 0% 0%);
}

@keyframes triangles {
  0% {
    transform: translateX(-250px);
  }
  100% {
    transform: translateX(-500px);
  }
}

.whaleContainer {
  position: relative;
  transform: translateX(0);
  animation-name: whaleTranslate;
  animation-duration: 10s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
  z-index: 7000;
}
@keyframes whaleTranslate {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(380px);
  }
}

.whalePos {
  position: absolute;
  z-index: 1000;
  &.size1 {
    top: 150px;
    left: -210px;
  }
  &.size2 {
    top: 100px;
    left: -280px;
  }
  &.size3 {
    top: 120px;
    left: -140px;
  }
  &.size4 {
    top: 190px;
    left: -310px;
  }
}
.whaleRotate {
  position: relative;
  width: 245px;
  height: 110px;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  &.size1 {
    transform: rotate(0) scale(.35);
    animation-name: whaleMovementXLarge;
  }
  &.size2 {
    transform: rotate(0) scale(.25);
    animation-name: whaleMovementLarge;
  }
  &.size3 {
    transform: rotate(0) scale(.15);
    animation-name: whaleMovementMedium;
  }
  &.size4 {
    transform: rotate(0) scale(.1);
    animation-name: whaleMovementSmall;
  }
  
}
@keyframes whaleMovementXLarge {
  0% {
    transform: rotate(0) scale(.35);
  }
  100% {
    transform: rotate(10deg) scale(.35);
  }
}
@keyframes whaleMovementLarge {
  0% {
    transform: rotate(0) scale(.25);
  }
  100% {
    transform: rotate(10deg) scale(.25);
  }
}
@keyframes whaleMovementMedium {
  0% {
    transform: rotate(0) scale(.15);
  }
  100% {
    transform: rotate(10deg) scale(.15);
  }
}
@keyframes whaleMovementSmall {
  0% {
    transform: rotate(0) scale(.1);
  }
  100% {
    transform: rotate(10deg) scale(.1);
  }
}
.whale {
  position: absolute;
  width: inherit;
  height: inherit;
  background: radial-gradient(at 40% 20%, #95d6df 0%,#95d6df 35%,#6db3c2 35%,#6db3c2 60%,#6db3c2 70%,#407a8b 70%,#407a8b 100%);
  clip-path: polygon(15% 0%, 18.5% 20%, 19% 37%, 27% 46.5%, 33% 46.5%, 42.5% 37%, 43% 26.5%, 50.5% 28.5%, 65.5% 17%, 88.5% 12.5%, 97.5% 22.5%, 100% 49.5%, 97% 65.5%, 89.5% 81.5%, 64.5% 86.5%, 43.5% 80%, 23% 59.5%, 15.5% 41.5%, 8% 40%, 1.5% 28.5%, 6.5% 25%, 12.5% 26.5%, 12% 14%);
}

.fin {
  position: absolute;
  top: 75%;
  left: 50%;
  z-index: 5000;
  width: 50px;
  height: 30px;
  background: #407A8B;
  transform-origin: center top;
  clip-path: polygon(30% 50%, 60% 0, 100% 0%, 80% 60%, 60% 80%, 0 100%);
  animation-name: fin;
  animation-duration: 2s;
  animation-iteration-count: infinite;
  animation-direction: alternate;
  animation-timing-function: linear;
}

@keyframes fin {
  0% {
    transform: rotate3d(0, 0, 0, 0deg);
  }
  100% {
    transform: rotate3d(1, 1, 1, 30deg);
  }
}



// floof
html, body {
  overflow: hidden;
}
body {
  background: #E6FFFF;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
View Compiled
// Inspired by an article called 100 days of design by Tiantian Xu
// https://uxdesign.cc/100-days-of-motion-design-463526af852f 

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.