Animación de carga CSS Estructura HTML

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Un código de Mete

HTML

CSS

* {
    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;
  }

.loading-element {
    position: relative;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background-color: #E6DB74;
    animation: loading-animation 1s linear infinite;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2), 0 0 50px rgba(0, 0, 0, 0.5), 0 0 100px rgba(255, 255, 255, 0.5);
  }

@keyframes loading-animation {
    0% {
      transform: scale(1);
      opacity: 1;
    }
    50% {
      transform: scale(1.1);
      opacity: 0.5;
    }
    100% {
      transform: scale(1);
      opacity: 1;
    }
  }

@keyframes fragment-disappearance {
    0% {
      opacity: 1;
    }
    100% {
      opacity: 0;
    }
  }

.fragment-1 {
    position: relative;
    width: 80px;
    height: 100px;
    border-radius: 10px;
    background-color: #66D9EF;
    transform: rotate(25deg);
    animation: fragment-animation 3s linear infinite;
  }

@keyframes fragment-animation {
    0% {
      transform: rotate(25deg) scale(1);
      bottom: -100px;
    }
    20% {
      transform: rotate(25deg) scale(1.5);
      bottom: 150px;
    }
    40% {
      transform: rotate(25deg) scale(1);
      bottom: -100px;
    }
    60% {
      transform: rotate(25deg) scale(0.5);
      bottom: -150px;
    }
    100% {
      transform: rotate(25deg) scale(1);
      bottom: -100px;
    }
  }

@keyframes fragment-disappearance {
    0% {
      opacity: 1;
    }
    100% {
      opacity: 0;
    }
  }

.fragment-2 {
    position: relative;
    width: 120px;
    height: 80px;
    border-radius: 10px;
    background-color: #F92672;
    transform: rotate(-30deg);
    animation: fragment-animation-2 2s linear infinite;
  }

@keyframes fragment-animation-2 {
    0% {
      transform: rotate(-30deg) scale(1);
      bottom: -80px;
    }
    20% {
      transform: rotate(-30deg) scale(1.2);
      bottom: 50px;
    }
    40% {
      transform: rotate(-30deg) scale(1);
      bottom: -80px;
    }
    60% {
      transform: rotate(-30deg) scale(0.8);
      bottom: -130px;
    }
    100% {
      transform: rotate(-30deg) scale(1);
      bottom: -80px;
    }
  }

.fragment-3 {
    position: relative;
    width: 150px;
    height: 60px;
    border-radius: 10px;
    background-color: #3E8E41;
    transform: rotate(45deg);
    animation: fragment-animation-3 4s linear infinite;
  }

@keyframes fragment-animation-3 {
    0% {
      transform: rotate(45deg) scale(1);
      bottom: -60px;
    }
    25% {
      transform: rotate(45deg) scale(1.1);
      bottom: 30px;
    }
    50% {
      transform: rotate(45deg) scale(1);
      bottom: -60px;
    }
    75% {
      transform: rotate(45deg) scale(0.9);
      bottom: -120px;
    }
    100% {
      transform: rotate(45deg) scale(1);
      bottom: -60px;
    }
  }

.loading-element::before {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #E6DB74;
    animation: fragment-disappearance 5s linear infinite;
  }