Fragmento de animación de carga de CSS

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HTML

CSS

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

body {
    background-color: #14161D;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
}

.codigo {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    background: #30322F;
    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: 50%;
    width: 100%;
    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; }
.brace          { color: #F8F8F2; }
.comment        { color: #75715E; }
.function       { color: #A6E22E; }

.animation-container {
    position: absolute;
    top: 75%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 50%;
    overflow: hidden;
    background: transparent;
}

.loading-screen {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    clip-path: circle(50% at 50% 50%);
    background: radial-gradient(circle at 50% 50%, rgba(255, 0, 0, 0.2), rgba(255, 0, 0, 0.8)); 
    animation: loading-pulse 1.5s infinite alternate-reverse; /* Animação de pulsos */
}

.loading-bar {
    width: 0%;
    height: 10px;
    background: #F92672;
    position: absolute;
    bottom: 20px;
    left: 0; 
    animation: loading-bar-progress 4s linear infinite; /* Animação de progresso */ 
}

@keyframes loading-pulse {
    0% { opacity: 0.2 }
    100% { opacity: 1 } 
}

@keyframes loading-bar-progress {
    0% { width: 0%;    
    100% { width: 100%; }
}

.codigo {
    /* Exemplo de código CSS para a animação */ 
    
    .selector { color: #F92672; }
    .property { color: #66D9EF; }
    .value-number { color: #AE81FF; }
    .value-string { color: #E6DB74; }
    .value-color { color: #A6E22E; }
    .brace { color: #F8F8F2; }
    .comment { color: #75715E; }

opacity: 0.7; /* Desfoque sutil para dar sensação de código antigo */

}