Fireworks & Fireflies Animation with CSS & JavaScript

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>Sunflower Night with Fireworks and Fireflies</title>
<style>
  body {
    margin: 0;
    height: 100vh;
    background: #000;
    overflow: hidden;
    position: relative;
    font-family: 'Comic Sans MS', cursive, sans-serif;
  }

/* Mensaje centrado arriba con duración larga */
  #mensaje-feliz {
    position: fixed;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    background: #ffeb3b;
    color: #333;
    font-weight: bold;
    font-size: 26px;
    padding: 20px 35px;
    border-radius: 10px;
    box-shadow: 0 0 15px #fbc02d;
    opacity: 1;
    animation: fadeOut 15s ease forwards;
    z-index: 10000;
    white-space: nowrap;
    text-align: center;
  }
  @keyframes fadeOut {
    0%, 93% { opacity: 1; }
    100% { opacity: 0; visibility: hidden; }
  }

/* Mensaje inferior */
  #mensaje-inferior {
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    background-color: #000;
    font-weight: bold;
    font-size: 28px;
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: 0 0 8px #000;
    z-index: 10001;
    white-space: nowrap;
  }

/* Fuegos artificiales */
  .firework {
    position: absolute;
    width: 4px;
    height: 4px;
    background: radial-gradient(circle, white 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
    box-shadow:
      0 0 6px 3px white,
      0 0 10px 5px white;
    animation: explode 1s ease forwards;
  }
  @keyframes explode {
    0% {
      transform: scale(0.5);
      opacity: 1;
    }
    100% {
      transform: scale(12);
      opacity: 0;
    }
  }

/* Luciérnagas */
  .firefly {
    position: fixed;
    background: radial-gradient(circle, #ffff99 0%, transparent 70%);
    border-radius: 50%;
    width: 6px;
    height: 6px;
    opacity: 0.8;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    box-shadow: 0 0 6px 3px #ffff99;
    z-index: 9000;
  }

/* Animaciones de movimiento para luciérnagas */
  @keyframes move1 { 0%, 100% { transform: translate(0, 0);} 50% { transform: translate(20px, 15px);} }
  @keyframes move2 { 0%, 100% { transform: translate(0, 0);} 50% { transform: translate(-15px, -10px);} }
  @keyframes move3 { 0%, 100% { transform: translate(0, 0);} 50% { transform: translate(10px, -20px);} }
  @keyframes move4 { 0%, 100% { transform: translate(0, 0);} 50% { transform: translate(-20px, 10px);} }
  @keyframes move5 { 0%, 100% { transform: translate(0, 0);} 50% { transform: translate(15px, 20px);} }

@keyframes glow {
    0%, 100% { opacity: 0.8; box-shadow: 0 0 6px 3px #ffff99; }
    50% { opacity: 0.3; box-shadow: none; }
  }
</style>
</head>
<body>

<div id="mensaje-feliz">Feliz 21 de septiembre mi amor❤️</div>
  <div id="mensaje-inferior">Para la más hermosa,Te amo mi Ferchi<3 </div>
  <div class="sunflower">
    <div class="flower_wrapper">
      <div class="flower_stem"></div>
      <div class="flower_center"></div>
      <div class="flower_petal flower_petal-1"></div>
      <div class="flower_petal flower_petal-2"></div>
      <div class="flower_petal flower_petal-3"></div>
      <div class="flower_petal flower_petal-4"></div>
      <div class="flower_petal flower_petal-5"></div>
      <div class="flower_petal flower_petal-6"></div>
      <div class="flower_petal flower_petal-7"></div>
      <div class="flower_petal flower_petal-8"></div>
      <div class="flower_petal flower_petal-9"></div>
      <div class="flower_petal flower_petal-10"></div>
      <div class="flower_petal flower_petal-11"></div>
      <div class="flower_petal flower_petal-12"></div>
      <div class="flower_leaf flower_leaf-1"></div>
      <div class="flower_leaf flower_leaf-2"></div>
      <div class="flower_light flower_light-1"></div>
      <div class="flower_light flower_light-2"></div>
      <div class="flower_light flower_light-3"></div>
      <div class="flower_light flower_light-4"></div>
      <div class="flower_light flower_light-5"></div>
      <div class="flower_light flower_light-6"></div>
      <div class="flower_light flower_light-7"></div>
      <div class="flower_light flower_light-8"></div>
    </div>
  </div>

// Fuegos artificiales
    function createFirework() {
      const firework = document.createElement('div');
      firework.className = 'firework';
      const size = Math.random() * 3 + 2;
      firework.style.width = size + 'px';
      firework.style.height = size + 'px';
      const color = colors[Math.floor(Math.random() * colors.length)];
      firework.style.background = `radial-gradient(circle, ${color} 0%, rgba(255,255,255,0) 70%)`;
      firework.style.boxShadow = `0 0 6px 3px ${color}, 0 0 10px 5px ${color}`;
      firework.style.position = 'absolute';
      firework.style.top = Math.random() * window.innerHeight + 'px';
      firework.style.left = Math.random() * window.innerWidth + 'px';
      firework.style.borderRadius = '50%';
      firework.style.opacity = '1';
      body.appendChild(firework);
      firework.style.animation = 'explode 1s ease forwards';
      setTimeout(() => {
        body.removeChild(firework);
      }, 1000);
    }
    setInterval(createFirework, 400);

// Muchas luciérnagas
    const moveAnims = ['move1', 'move2', 'move3', 'move4', 'move5'];
    for(let i = 0; i < 50; i++) {
      const firefly = document.createElement('div');
      firefly.className = 'firefly';
      firefly.style.top = (Math.random() * 100) + 'vh';
      firefly.style.left = (Math.random() * 100) + 'vw';
      const moveAnim = moveAnims[i % moveAnims.length];
      const durMove = (Math.random() * 8 + 4).toFixed(2);
      const durGlow = (Math.random() * 2 + 1).toFixed(2);
      firefly.style.animation = `${moveAnim} ${durMove}s ease-in-out infinite, glow ${durGlow}s ease-in-out infinite`;
      firefly.style.animationDelay = `${Math.random() * 5}s, ${Math.random() * 5}s`;
      body.appendChild(firefly);
    }
  </script>

CSS

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: linear-gradient(to top, #00d4ff, #000); 
    --line-color: linear-gradient(to left top, #82ff86 20%, #144425, #104e1c);
    --flower-center: radial-gradient(circle, #000, #ff5e00);
    --leaf-color: radial-gradient(circle, #82ff86, #104e1c);
    --petal-color: radial-gradient(circle, #ff5e00, #ffbb00);
}

body{
    background-image: var(--color-bg);
    min-height: 100vh;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    overflow: hidden;
}

.flower_wrapper{
    position: absolute;
    left: 50%;
    bottom: 2vmin;
    animation: moving-flower-1 4s linear infinite;
}

.flower_stem{
    width: 2vmin;
    height: 65vmin;
    background-image: var(--line-color);
    border-radius: 4vmin;
    animation-delay: 0.3s;
}

.flower_center{
    position: absolute;
    top: 0vmin;
    left: 50%;
    z-index: 5;
    transform: translateX(-50%) rotate(-10deg);
    width: 20vmin;
    height: 20vmin;
    border-radius: 50%;
    background: var(--flower-center);
    animation: open-flower-middle 2s 0.4s backwards;
}

.flower_petal{
    position: absolute;
    left: 50%;
    z-index: 3;
    bottom: 55vmin;
    transform: translateX(-50%);
    width: 7vmin;
    height: 17vmin;
    height: 20vmin;
    background: var(--petal-color);
    clip-path: ellipse(50% 50% at 50% 50%);
    transform-origin: center bottom;
    animation: open-flower 2s 1s backwards;
}

.flower_petal-1{
    border-radius: 50% 50% 50% / 80% 80% 20% 20%;
    background-image: none;
    background: var(--petal-color);
    animation: open-flower 1.4s 1s backwards;
}

.flower_petal-2{
    transform: translateX(-50%) rotate(-30deg);
}
.flower_petal-3{
    transform: translateX(-50%) rotate(-60deg);
}
.flower_petal-4{
    transform: translateX(-50%) rotate(-90deg);
}
.flower_petal-5{
    transform: translateX(-50%) rotate(-120deg);
}
.flower_petal-6{
    transform: translateX(-50%) rotate(-150deg);
}
.flower_petal-7{
    transform: translateX(-50%) rotate(30deg);
}
.flower_petal-8{
    transform: translateX(-50%) rotate(60deg);
}
.flower_petal-9{
    transform: translateX(-50%) rotate(90deg);
}
.flower_petal-10{
    transform: translateX(-50%) rotate(120deg);
}
.flower_petal-11{
    transform: translateX(-50%) rotate(150deg);
}
.flower_petal-12{
    transform: translateX(-50%) rotate(180deg);
}

.flower_leaf{
    position: absolute;
    left: 60%;
    bottom: 18vmin;
    transform: translateX(-45%) rotate(80deg);
    width: 7vmin;
    height: 17vmin;
    background: var(--leaf-color);
    clip-path: none;
    border-radius: 10vmin 2vmin 10vmin 2vmin;
    transform-origin: center bottom;
}

.flower_leaf-1{
    bottom: 18vmin;
    transform: translateX(-45%) rotate(80deg);
}

.flower_leaf-2{
    bottom: 23vmin;
    transform: translateX(-55%) rotate(-80deg);
}

.flower_light{
    position: absolute;
    bottom: 70vmin;
    width: 1vmin;
    height: 1vmin;
    background-color: rgb(255, 251, 0);
    border-radius: 50%;
    filter: blur(0.2vmin);
    animation: light-ans 4s linear infinite backwards;
}

:nth-child(odd){
        background-color: #23f0ff;
    }

.flower_light-1{
        left: -2vmin;
        animation-delay: 1s;
    }

.flower_light-2{
        left: 3vmin;
        animation-delay: 0.5s;
    }

.flower_light-3{
        left: -6vmin;
        animation-delay: 0.3s;
    }

.flower_light-4{
        left: 6vmin;
        animation-delay: 0.9s;
    }

.flower_light-5{
        left: -1vmin;
        animation-delay: 1.5s;
    }

.flower_light-6{
        left: -4vmin;
        animation-delay: 3s;
    }

.flower_light-7{
        left: 3vmin;
        animation-delay: 2s;
    }

.flower_light-8{
        left: -6vmin;
        animation-delay: 3.5s;
    }

.light{
    position: absolute;
    bottom: 0vmin;
    width: 1vmin;
    height: 1vmin;
    background-color: rgb(255, 251, 0);
    border-radius: 50%;
    filter: blur(0.2vmin);
    animation: light-ans-background 7s linear infinite backwards;
}
    :nth-child(odd){
        background-color: #23f0ff;
    }

.light-1{
        left: 10vmin;
        animation-delay: 1s;
    }

.light-2{
        left: 20vmin;
        animation-delay: 0.5s;
    }

.light-3{
        left: 60vmin;
        animation-delay: 0.3s;
    }

.light-4{
        left: 80vmin;
        animation-delay: 0.9s;
    }

.light-5{
        left: 45vmin;
        animation-delay: 1.5s;
    }

.light-6{
        left: 10vmin;
        animation-delay: 3s;
    }

.light-7{
        left: 90vmax;
        animation-delay: 2s;
    }

.light-8{
        left: 60vmax;
        animation-delay: 3.5s;
    }

.light-9{
        left: 70vmax;
        animation-delay: 2s;
    }

.light-10{
        left: 95vmax;
        animation-delay: 3.5s;
    }

.light-11{
        left: 75vmax;
        animation-delay: 3s;
    }

.light-12{
        left: 85vmax;
        animation-delay: 0.5s;
    }

@keyframes open-flower-leaves{
    0%{
        opacity: 0;
        transform: translateX(-50%) scale(0);
    }
}

@keyframes open-flower{
    0%{
        transform: translateX(-50%) rotate(0);
    }

Fireworks & Fireflies Animation with CSS & JavaScript

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