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HTML

              
                <!-- Click on cloud! -->

<!-- Design rights purchased with altering permissions from Marija Stanic original at https://dribbble.com/shots/6171532-Baby-cloud -->
<svg viewBox="0 0 15.09 9.82" class="clouds cloud1" id="cloud1">
  <path  d="M3.9,9.78a2.81,2.81,0,0,1-.5,0,3.35,3.35,0,0,1-.83-6.61,5,5,0,0,1,9.56.89h.07a2.86,2.86,0,1,1,0,5.72H3.9Z"/>
</svg>

<svg viewBox="0 0 29.45 17.45" class="clouds cloud2" id="cloud2">
    <path d="M26.06,17.45H4.66A4.68,4.68,0,0,1,3.1,8.37,7.94,7.94,0,0,1,13.2,1.82,4.61,4.61,0,0,1,16.87,0a4.69,4.69,0,0,1,4.65,4.74h.19a4.73,4.73,0,0,1,4.72,4.74,4.83,4.83,0,0,1-.2,1.37,3.3,3.3,0,0,1-.11,6.6Z"/>
</svg>

<svg viewBox="0 0 15.45 9.45" class="clouds cloud3" id="cloud3">
    <path d="M13.57,9.45H2A2,2,0,0,1,0,7.47,2,2,0,0,1,1,5.75a4.9,4.9,0,0,1-.11-1A4.69,4.69,0,0,1,5.53,0,4.63,4.63,0,0,1,9.62,2.48a2.66,2.66,0,0,1,1.63-.56A2.75,2.75,0,0,1,14,4.73a3,3,0,0,1-.11.79,2,2,0,0,1-.27,3.93Z" />
</svg>

<svg viewBox="0 0 11.82 7.82" class="clouds cloud4" id="cloud4">
    <path d="M8.8,7.79a2.34,2.34,0,0,0,.38,0,2.67,2.67,0,0,0,.64-5.26,3.9,3.9,0,0,0-7.5.67H2.26a2.3,2.3,0,0,0,0,4.59H8.8Z" />
</svg>

<svg viewBox="0 0 25.45 13.09" class="clouds cloud5" id="cloud5">
  <path d="M2.52,13.09H22.18a3.3,3.3,0,0,0,.53-6.56,2.47,2.47,0,0,0,.1-.67A2.22,2.22,0,0,0,20.6,3.62a2.33,2.33,0,0,0-.7.11A6.56,6.56,0,0,0,8.75,2.61a4.77,4.77,0,0,0-1.82-.37A4.69,4.69,0,0,0,2.42,8.11a2.49,2.49,0,0,0,.1,5Z" />
</svg>

<div style="position: absolute; width: 100%; height: 100%" id="extra-clouds"></div>

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48.09 29.36" id="happy-cloud" class="pos-center">
  <g id="main">
    <path id="cloud" d="M43.36,16.67a9.4,9.4,0,0,0,.23-2.05A8.8,8.8,0,0,0,30,7.16,14.61,14.61,0,0,0,2.87,14.68a14.14,14.14,0,0,0,.25,2.68,6.47,6.47,0,0,0,3.31,12h35.3a6.46,6.46,0,0,0,1.63-12.69Z"/>
    <path id="mouth" d="M18.85,22.49a2.32,2.32,0,0,1-.46,0,2.21,2.21,0,0,1-1.51-1.17.31.31,0,0,1,.56-.28,1.58,1.58,0,0,0,2.48.45.31.31,0,0,1,.44,0,.32.32,0,0,1,0,.45A2.2,2.2,0,0,1,18.85,22.49Z"/>
      <ellipse class="cheeks" cx="9.7" cy="19" rx="2.7" ry="2.1" transform="rotate(12) translate(4, -2)"/>
      <ellipse class="cheeks" cx="28" cy="17" rx="2.7" ry="2.1" transform="rotate(12) translate(4, -2)"/>
    <g id="eye_left" class="eye">
      <ellipse class="open" cx="11.92" cy="16.26" rx="1.75" ry="1.76" transform="translate(-2.88 2.57) rotate(-11)"/>
      <circle class="fleck" cx="12.39" cy="15.83" r="0.65"/>
    </g>
    <g id="eye_right" class="eye">
      <ellipse class="open" cx="26.54" cy="18.03" rx="1.75" ry="1.76" transform="translate(-2.95 5.4) rotate(-11)"/>
      <circle class="fleck" cx="27.01" cy="17.6" r="0.65"/>
  </g>
  </g>
</svg>

              
            
!

CSS

              
                :root {
  --bg: #13142b;
  --clouds: #2b344d;
  --open: #14132b;
  --fleck: #87aad5;
  --mouth: #14132b;
  --cloud: #87aad5;
  --dur: 1s;
}
.day {
  --bg: #A9C8E1;
  --clouds: #C8E1F1;
  --open:#2b344d;
  --fleck: #E0F0F7;
  --mouth: #2b344d;
  --cloud: #E0F0F7;
}

* {
  margin: 0;
  padding: 0;
}
body,
html {
  width: 100%;
  height: 100%;
  overflow: hidden;
  -webkit-tap-highlight-color:  rgba(255, 255, 255, 0);
}
body {
  background: var(--bg);
  transition: background var(--dur);
}
svg {
  visibility: hidden;
  position: absolute;
}
.pos-center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate3d(-50%, -50%, 0);
}
#happy-cloud {
  margin-left: 2vmin;
  overflow: visible;
}

#cloud {
  fill: var(--cloud);
  transition: fill var(--dur);
}
#happy-cloud *:hover {cursor: pointer}
#mouth {
  fill: var(--mouth);
  transition: fill var(--dur);
}
.clouds {
  fill: var(--clouds);
  transition: fill var(--dur);
}
.open {
  fill: var(--open);
  transition: fill var(--dur);
}
.fleck {
  fill: var(--fleck);
  transition: fill var(--dur);
}
.cheeks {
  opacity: 0;
  fill: var(--bg);
  transition: var(--dur);
}

.heart {
  position: absolute;
}
.heart:before,
.heart:after {
  position: absolute;
  content: "";
  left: 5vmin;
  top: 0;
  width: 5vmin;
  height: 8vmin;
  background: currentColor;
  border-radius: 5vmin 5vmin 0 0;
  transform: rotate(-45deg);
  transform-origin: 0 100%;
}
.heart:after {
  left: 0;
  transform: rotate(45deg);
  transform-origin: 100% 100%;
}

              
            
!

JS

              
                let heartTimer = null
const bounce = new TimelineMax({
  repeat: -1
});
const main = document.getElementById("main");
const mouth = document.getElementById("mouth");
bounce
  .set(mouth, { scale: 1.3, y: 0.25, transformOrigin: "center" })
  .to(
    main,
    2.5,
    {
      ease: Power1.easeInOut,
      y: -5,
      transformOrigin: "center",
      scale: 1.04,
      rotation: 0.5
    },
    0.05
  )
  .to(
    main,
    2.5,
    {
      ease: Power1.easeInOut,
      y: 0,
      transformOrigin: "center",
      scale: 1,
      rotation: 0
    },
    3.15
  );

const fleck = document.getElementsByClassName("fleck");
const eyes = document.getElementsByClassName("eye");
const blink = new TimelineMax({ repeat: -1 });
blink
  .to(eyes, 0.1, { scaleY: 0.3, transformOrigin: "center" }, 6)
  .to(fleck, 0.05, { opacity: 0 }, 6)
  .to(eyes, 0.1, { scaleY: 1, transformOrigin: "center" })
  .to(fleck, 0.1, { opacity: 1 }, 6.15);

const placeExtraClouds = ({
  id,
  left,
  waveLength,
  innerWidth,
  freq,
  width
}) => {
  let items = freq - 1;
  let curLeft = left;
  while (items > 0) {
    const nextLeft = curLeft - waveLength;
    if (nextLeft + width > 0) {
      curLeft = nextLeft;
      items--;
    } else {
      curLeft = nextLeft + innerWidth;
      items--;
    }
    const addCloud = document.getElementById(id).cloneNode(true);
    addCloud.id = "";
    addCloud.style.left = curLeft;
    document.getElementById("extra-clouds").append(addCloud);
  }
};

const initClouds = () => {
  const { innerWidth, innerHeight } = window;
  const happyCloud = document.getElementById("happy-cloud");
  const ratio = 1.6379;
  let height;
  let width;
  if (innerWidth > innerHeight) {
    height = innerHeight * 0.45;
    width = height * ratio;
  } else {
    width = innerWidth * 0.73;
    height = width / ratio;
  }
  happyCloud.style.width = width;
  happyCloud.style.height = height;
  happyCloud.style.visibility = "visible";

  const { left, top, bottom, right } = happyCloud.getBoundingClientRect();
  const freq = Math.round(innerWidth / (width * 1.5));
  const waveLength = innerWidth / freq;
  const extraClouds = document.getElementById("extra-clouds");
  while (extraClouds.hasChildNodes()) {
    extraClouds.removeChild(extraClouds.lastChild);
  }

  // Place all clouds in relation to happy cloud
  const cloud1 = document.getElementById("cloud1");
  cloud1.style.width = width * 0.32;
  cloud1.style.left = left + width * 0.45;
  cloud1.style.top = top - height * 1.02;
  cloud1.style.visibility = "visible";
  placeExtraClouds({
    id: "cloud1",
    left: left + width * 0.45,
    waveLength,
    innerWidth,
    freq
  });

  const cloud2 = document.getElementById("cloud2");
  cloud2.style.width = width * 0.63;
  cloud2.style.left = left - width * 0.35;
  cloud2.style.top = top - height * 0.7;
  cloud2.style.visibility = "visible";
  placeExtraClouds({
    id: "cloud2",
    left: left - width * 0.35,
    waveLength,
    innerWidth,
    freq,
    width: width * 0.63
  });

  const cloud3 = document.getElementById("cloud3");
  cloud3.style.width = width * 0.32;
  cloud3.style.left = right + width * 0.02;
  cloud3.style.top = top - height * 0.03;
  cloud3.style.visibility = "visible";
  placeExtraClouds({
    id: "cloud3",
    left: right + width * 0.02,
    waveLength,
    innerWidth,
    freq,
    width: width * 0.32
  });

  const cloud4 = document.getElementById("cloud4");
  cloud4.style.width = width * 0.25;
  cloud4.style.left = right - width * 0.12;
  cloud4.style.top = bottom + height * 0.15;
  cloud4.style.visibility = "visible";
  placeExtraClouds({
    id: "cloud4",
    left: right - width * 0.12,
    waveLength,
    innerWidth,
    freq,
    width: width * 0.25
  });

  const cloud5 = document.getElementById("cloud5");
  cloud5.style.width = width * 0.5;
  cloud5.style.left = left;
  cloud5.style.top = bottom + height * 0.3;
  cloud5.style.visibility = "visible";
  placeExtraClouds({
    id: "cloud5",
    left: left,
    waveLength,
    innerWidth,
    freq,
    width: width * 0.5
  });
};

// Clouds parallax
let loops = 1;
const anim = () => {
  const clouds = document.getElementsByClassName("clouds");
  for (let i = 0, len = clouds.length; i < len; i++) {
    const cloud = clouds[i];
    let { width, left } = cloud.getBoundingClientRect();
    let move = false;
    if (
      cloud.classList.contains("cloud1") ||
      cloud.classList.contains("cloud4")
    ) {
      move = loops % 4 === 1;
    }
    if (cloud.classList.contains("cloud3")) {
      move = loops % 4 === 1;
    }
    if (cloud.classList.contains("cloud2")) {
      move = loops % 2 === 1;
    }
    if (cloud.classList.contains("cloud5")) {
      move = loops % 3 === 1;
    }

    const styleLeft = Math.round(cloud.style.left.split("px")[0]);
    let nextPos = Math.round(left) - styleLeft - 2;
    if (Math.round(left) - 1 + width < 0) nextPos += innerWidth + width;
    if (move) cloud.style.transform = `translate3d(${nextPos}px, 0, 0)`;
  }
  loops++;
  requestAnimationFrame(anim);
};

const mouseUp = () => {
  clearInterval(heartTimer)
  heartTimer = null
  
  const open = new TimelineMax();
  open
    .to(eyes, 0.1, { scaleY: 1, transformOrigin: "center" }, 0)
    .to(fleck, 0.1, { opacity: 1 }, 0.05);

  const cheeks = document.getElementsByClassName("cheeks");
  const haltBlush = new TimelineMax();
  haltBlush
    .to(cheeks, 0.3, { opacity: 0 });
  
  // Resume
  blink.resume(3);
  window.removeEventListener('mouseup', mouseDown)
};

const colors = [
  "#fc3ad8",
  "#c53df7",
  "#f7e522",
  "#fc4c46",
  "#10f204",
  "#f21d2b",
  "#11e0dc",
  "#31a9f9"
];
const pickRandom = list => {
  const len = list.length;
  return list[Math.floor(Math.random() * len)];
};

const floatHeart = () => {
  const { left, width, top, height, bottom } = main.getBoundingClientRect();
  const sign = Math.round(Math.random()) ? -1 : 1;
  let heart = document.createElement("div");
  heart.classList.add("heart");
  document.body.appendChild(heart);
  
  const float = new TimelineMax({
    onComplete: function() {
      heart.remove();
      heart = null;
    }
  });
  const { innerWidth, innerHeight } = window;
  const vmin = Math.min(innerWidth, innerHeight) / 100;
  const heartLeft = Math.random() * width * 0.4 + width * 0.1 + left;
  const heartTop = Math.random() * height * .1 * sign + top
  const heartUp = (heartTop + 8 * vmin) / 4
  const heartHorizDelta = width * .05 * Math.random() + width * .03
  float
    .set(heart, { scale: 0.5, left: heartLeft, top: heartTop, color: pickRandom(colors) }, 0)
    .to(
      heart,
      heartTop / 80,
      {
        bezier: [
          { x: sign * heartHorizDelta, y: -heartUp },
          { x: 0, y: -heartUp * 2 },
          { x: sign * -1 * heartHorizDelta, y: -heartUp * 3 },
          { x: 0, y: -heartUp * 4 }
        ],
        ease: Linear.easeNone
      },
      0
    )
    .to(heart, 4, { scale: 1, color: pickRandom(colors) }, 0);
}

// Clicking on cloud <3
const mouseDown = (e) => {
  blink.pause();

  // Blink real quick
  const close = new TimelineMax();
  close
    .to(eyes, 0.08, { scaleY: 0.3, transformOrigin: "center" }, 0)
    .to(fleck, 0.05, { opacity: 0 }, 0)

  const cheeks = document.getElementsByClassName("cheeks");
  const blush = new TimelineMax();
  blush
    .to(cheeks, 0.05, { opacity: 0.15 })

  floatHeart()
  heartTimer = setInterval(function () {floatHeart()}, 300)
  
  window.addEventListener('mouseup', mouseUp)
};

initClouds();
requestAnimationFrame(anim);
window.addEventListener("resize", initClouds);
main.addEventListener("mousedown", mouseDown);
// document.body.classList.add('day')
// setTimeout(function () {
//   document.body.classList.remove('day')
// }, 3000)
              
            
!
999px

Console