CSS Loading Animation HTML Structure

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.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;
  aspect-ratio: 9/16;
}

/* 
  Layers e motivação emocional
*/
.loading-element {
  background-color: #333333;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  animation: loading-animation 1s linear infinite;
  position: relative;
}

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

.layer1 {
  width: 100%;
  height: 100%;
  background-color: #4D4D4D;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  transition: opacity 1s;
}

.layer1::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #3F3F3F;
  width: 20px;
  height: 20px;
  border-radius: 50%;
}

/* 
  Micro-detalhes para o replay value
*/
.layer2 {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #3F3F3F;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  animation: detalhe 2s linear infinite;
}

@keyframes detalhe {
  50% {
    transform: scale(1);
    background-color: #666666;
  }
  100% {
    transform: scale(0);
    background-color: #3F3F3F;
  }
}

/* 
  Interações entre camadas e elementos
*/
.layer3 {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: #2F2F2F;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: interacao 2s linear infinite;
}

@keyframes interacao {
  50% {
    transform: scale(1);
    background-color: #777777;
  }
  100% {
    transform: scale(0);
    background-color: #2F2F2F;
  }
}

CSS Loading Animation HTML Structure

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