Fondo animado CSS con formas y texto

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HTML

<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <style>
    * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background:url("./thumb.jpg") no-repeat center center;
    background-color: black;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
}

.codigo {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    background: #272822;
    color: #F8F8F2;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 18px;
    padding: 20px;
    border-radius: 8px;
    white-space: pre-line;
    text-align: left;
    line-height: 1.6;
    max-height: 25%;
    max-width: 75%;
    width: 75%;
    height: 25%;
    top:15%;
    overflow-y: hidden;
     box-shadow: -8px 10px 18px rgba(0, 0, 0, 0.55);
}

.selector       { color: #F92672; }
    .property       { color: #66D9EF; }
    .value-number   { color: #AE81FF; }
    .value-string   { color: #E6DB74; }
    .value-color    { color: #A6E22E; }
    .function       { color: #A6E22E; }

.animation-container {
        position: absolute;
        top: 75%;
        left: 50%;
        transform: translate(-50%, -50%);
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: 50%;
        overflow: hidden;
        background: transparent;
    }

/* O fundo de memória é um cenário de sombra que desaparece e reaparece */
    .memory-background {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        transform: scale(1.2);
        animation: memory-dissolve 2s infinite;
    }

@keyframes memory-dissolve {
        0% {
            opacity: 1;
        }
        20% {
            opacity: 0;
        }
        50% {
            transform: scale(0);
        }
        80% {
            transform: scale(1.2);
        }
        100% {
            opacity: 1;
        }
    }

/* As lembranças são formas que se movem e mudam */
    .memory-shapes {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        justify-content: center;
        animation: memory-shift 2s infinite;
    }

@keyframes memory-shift {
        0% {
            transform: translateX(-100%);
        }
        50% {
            transform: translateX(100%);
        }
        100% {
            transform: translateX(-100%);
        }
    }

.memory-shapes div {
        width: 100px;
        height: 100px;
        background-color: #4CAF50;
        transform: rotate(-45deg);
        animation: memory-pulse 2s infinite;
    }

@keyframes memory-pulse {
        0% {
            opacity: 0;
        }
        50% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
    }

/* A animação de dúvida é um questionamento contínuo */
    .doubt-animation {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        justify-content: center;
        animation: doubt-loop 2s infinite;
    }

@keyframes doubt-loop {
        0% {
            transform: translateX(-100%);
        }
        50% {
            transform: translateX(100%);
        }
        100% {
            transform: translateX(-100%);
        }
    }

.doubt-animation div {
        width: 100px;
        height: 100px;
        background-color: #FF69B4;
        animation: doubt-pulse 2s infinite;
    }

@keyframes doubt-pulse {
        0% {
            opacity: 0;
        }
        50% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
    }

.loading-element {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: #4CAF50;
        border-radius: 50%;
        animation: loading-animation 2s infinite;
    }

@keyframes loading-animation {
        0% {
            opacity: 0;
        }
        50% {
            opacity: 1;
        }
        100% {
            opacity: 0;
        }
        0% {
            transform: scale(1);
        }
        80% {
            transform: scale(1.2);
        }
        100% {
            transform: scale(1);
        }
    }

</style>
</head>
<body>
    <div class="animation-container">
        <div class="memory-background"></div>
        <div class="memory-shapes">
            <div></div>
            <div></div>
            <div></div>
        </div>
        <div class="doubt-animation">
            <div></div>
            <div></div>
            <div></div>
        </div>
        <div class="loading-element"></div>
    </div>

</body>
</html>

CSS

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
  			background: black;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
            overflow: hidden;
        }
        
        .codigo {
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            background: #272822;
            color: #F8F8F2;
            font-family: 'Consolas', 'Monaco', monospace;
            font-size: 18px;
            padding: 20px;
            border-radius: 8px;
            white-space: pre-line;
            text-align: left;
            line-height: 1.6;
            max-height: 25%;
            max-width: 75%;
            width: 75%;
            height: 25%;
            top:15%;
            overflow-y: hidden;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }
        
        .selector       { color: #F92672; }
        .property       { color: #66D9EF; }
        .value-number   { color: #AE81FF; }
        .value-string   { color: #E6DB74; }
        .value-color    { color: #A6E22E; }
        .function       { color: #A6E22E; }

.animation-container {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            aspect-ratio: 9/16;
            height: 90vh;
            overflow: hidden;
            background: transparent;
        }
        
        @keyframes loading-animation {
            0% {
                transform: scale(1) rotate(0deg);
                background-size: 200px 200px;
            }
            25% {
                transform: scale(1.2) rotate(90deg);
                background-size: 220px 220px;
            }
            50% {
                transform: scale(1) rotate(180deg);
                background-size: 240px 240px;
            }
            100% {
                transform: scale(1) rotate(360deg);
                background-size: 260px 260px;
            }
        }
        
        @keyframes branching {
            0% {
                transform: scale(1);
            }
            100% {
                transform: scale(2);
            }
        }
        
        .loading-element {
            position: relative;
            width: 60px;
            height: 60px;
            background-size: 200px 200px;
            border-radius: 50%;
            animation: loading-animation 1s linear infinite;
        }
        
        .loading-element:before {
            content: "";
            position: absolute;
            width: 30px;
            height: 30px;
            background-color: red;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: loading-animation 1s linear infinite;
        }
        
        .loading-element:after {
            content: "";
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: transparent;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: loading-animation 1s linear infinite;
        }
        
        .branching-element {
            position: relative;
            width: 40px;
            height: 40px;
            background-size: 100px 100px;
            border-radius: 50%;
            animation: branching 2s linear infinite;
        }
        
        .branching-element:before, .branching-element:after {
            content: "";
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: white;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: branching 2s linear infinite;
        }
        
        .branching-element:before:before, .branching-element:before:after, .branching-element:after:before, .branching-element:after:after {
            content: "";
            position: absolute;
            width: 10px;
            height: 10px;
            background-color: red;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: branching 2s linear infinite;
        }
        
        /* A cada rodada, adiciona uma camada nova. Isso simboliza o crescimento do entendimento e a multiplicação das ideias. */
        @keyframes crescimento {
            0% {
                transform: scale(1);
            }
            100% {
                transform: scale(2);
            }
        }
        
        .crescende {
            position: relative;
            width: 20px;
            height: 20px;
            background-size: 40px 40px;
            border-radius: 50%;
            animation: crescimento 3s linear infinite;
        }
        
        .crescende:before, .crescende:after {
            content: "";
            position: absolute;
            width: 10px;
            height: 10px;
            background-color: transparent;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            animation: crescimento 3s linear infinite;
        }
        
        /* Com a cada nova ideia, sentimo uma sensação de liberdade e crescimento. */
        
        /* A cada rodada, a carga é maior, representando o aumento da sabedoria e a busca pela perfeição. */
        
        .carregamento {
            position: relative;
            width: 50%;
            height: 50%;
            background-size: 100px 100px;
            border-radius: 50%;
            animation: loading-animation 2s linear infinite;
        }
        
        .carregamento:before {
            content: "";
            position: absolute;
            width: 25%;
            height: 25%;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: linear-gradient(to bottom right, #03A9F4, #3F87F5);
            animation: crescimento 2s linear infinite;
        }
        
        .carregamento:after {
            content: "";
            position: relative;
            width: 10%;
            height: 10%;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: linear-gradient(to bottom right, #03A9F4, #3F87F5);
            animation: crescimento 2s linear infinite;
        }