Webleb - UI Elements - Happy Mother's day

HTML

CREDITS TO: https://codepen.io/oliverjam/pen/WwQqWv
<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Feliz dia das mães</title>
    <style>
    @import url(https://fonts.googleapis.com/css?family=Oleo+Script);
    @import url(https://fonts.googleapis.com/css?family=Poiret+One);
    body {
    background: #45b9d3;
    color: white;
    overflow: hidden;
    }

.dark {
    position: absolute;
    width: 100%;
    top: 0;
    bottom: 0;
    background: rgba(29, 25, 52, 0.9);
    z-index: 5000;
    }

h1, h2 {
    position: relative;
    text-align: center;
    font-family: "Poiret One", "Oleo Script", cursive;
    text-shadow: 1px 1px 1px rgba(77, 77, 77, 0.5);
    z-index: 1000;
    margin: 0;
    }

h1 {
    margin-top: 4.5rem;
    font-size: 8vw;
    }

h2 {
    font-size: 6vw;
    font-family: "Oleo Script", cursive;
    }

.sun {
    position: absolute;
    top: 2rem;
    left: 2rem;
    width: 3rem;
    height: 3rem;
    background: khaki;
    border-radius: 100%;
    box-shadow: 0 0 20px khaki;
    }

.flowers {
    position: absolute;
    width: 100%;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    }

.flower {
    display: flex;
    flex-direction: column;
    align-items: center;
    }
    .flower_head {
    height: 7rem;
    width: 7rem;
    background: #cba8ed;
    border-radius: 100%;
    }
    .flower_stem {
    width: 0.5rem;
    height: 20rem;
    max-height: 0;
    background: green;
    }
    .flower_stem::after {
    content: "";
    margin-left: 0.5rem;
    margin-top: 1rem;
    width: 3em;
    height: 3em;
    display: block;
    background: green;
    border-radius: 2em 0 2em 0em;
    }

.red {
    width: 6rem;
    height: 6rem;
    background: #ff4b4b;
    }

.fadeIn {
    opacity: 0;
    -webkit-animation: fadeIn 1s 2s ease-in forwards;
            animation: fadeIn 1s 2s ease-in forwards;
    }

.slideIn {
    transform: translateX(-5rem);
    -webkit-animation: slideIn 3s ease-out forwards;
            animation: slideIn 3s ease-out forwards;
    }

.fadeOut {
    opacity: 1;
    -webkit-animation: fadeOut 4s 0.25s ease forwards;
            animation: fadeOut 4s 0.25s ease forwards;
    }

.grow-12 {
    -webkit-animation: grow-12 2s 0.5s ease-in-out forwards;
            animation: grow-12 2s 0.5s ease-in-out forwards;
    }

.grow-15 {
    -webkit-animation: grow-15 2s 1.5s ease-in-out forwards;
            animation: grow-15 2s 1.5s ease-in-out forwards;
    }

.grow-9 {
    -webkit-animation: grow-9 2s 2.5s ease-in-out forwards;
            animation: grow-9 2s 2.5s ease-in-out forwards;
    }

.pulse {
    -webkit-animation: pulse 1s 0.5s ease-in-out infinite alternate;
            animation: pulse 1s 0.5s ease-in-out infinite alternate;
    }

@-webkit-keyframes fadeIn {
    100% {
        opacity: 1;
    }
    }

@keyframes fadeIn {
    100% {
        opacity: 1;
    }
    }
    @-webkit-keyframes slideIn {
    100% {
        transform: translateX(0);
    }
    }
    @keyframes slideIn {
    100% {
        transform: translateX(0);
    }
    }
    @-webkit-keyframes fadeOut {
    100% {
        opacity: 0;
    }
    }
    @keyframes fadeOut {
    100% {
        opacity: 0;
    }
    }
    @-webkit-keyframes grow-12 {
    100% {
        max-height: 14rem;
    }
    }
    @keyframes grow-12 {
    100% {
        max-height: 14rem;
    }
    }
    @-webkit-keyframes grow-15 {
    100% {
        max-height: 17rem;
    }
    }
    @keyframes grow-15 {
    100% {
        max-height: 17rem;
    }
    }
    @-webkit-keyframes grow-9 {
    100% {
        max-height: 11rem;
    }
    }
    @keyframes grow-9 {
    100% {
        max-height: 11rem;
    }
    }
    @-webkit-keyframes pulse {
    0% {
        transform: scale(1);
    }
    100% {
        transform: scale(1.1);
    }
    }
    @keyframes pulse {
    0% {
        transform: scale(1);
    }
    100% {
        transform: scale(1.1);
    }
    }
    @media (max-width: 480px) {
    h1 {
        font-size: 2.777rem;
    }

h2 {
        font-size: 1.777rem;
    }
    }
    </style>
</head>
<body>
    
<div class="dark fadeOut"></div>
<div class="sun slideIn"></div>
<h1 class="fadeIn">Feliz dia das mães</h1>
<section class="flowers">
  <div class="flower">
    <div class="flower_head pulse red"></div>
    <div class="flower_stem grow-12"></div>
  </div>
  <div class="flower">
    <div class="flower_head pulse red"></div>
    <div class="flower_stem grow-15"></div>
  </div>
  <div class="flower">
    <div class="flower_head pulse red"></div>
    <div class="flower_stem grow-9"></div>
  </div>
</section>
    
</body>
</html>

CSS

JS