Trecho de animação de carregamento CSS

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/* css_foundation */
    * {
      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 rules */
    @keyframes loading {
      0% {
        transform: rotate(0deg);
      }
      100% {
        transform: rotate(360deg);
      }
    }

.loading-element {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      animation: loading 2s linear infinite;
    }

.loading-element::before {
      content: "";
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background-color: #f92672;
      animation: loading 1s linear infinite;
    }

.loading-element:nth-child(3) {
      animation-delay: 2s;
    }

.loading-element:nth-child(3)::before {
      animation-delay: 1s;
    }

/* animated layers */
    .layer-1 {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 100%;
      height: 50%;
      background-color: #66d9ef;
      z-index: 1;
    }

.layer-1::after {
      content: "";
      position: absolute;
      top: 100%;
      left: 0;
      width: 0%;
      height: 100%;
      background-color: #66d9ef;
      z-index: -1;
      animation: animate-layer 2s linear infinite;
    }

.layer-2 {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 100%;
      height: 50%;
      background-color: #a6e22e;
      z-index: 2;
    }

.layer-2::after {
      content: "";
      position: absolute;
      top: 100%;
      left: 0;
      width: 0%;
      height: 100%;
      background-color: #a6e22e;
      z-index: -2;
      animation: animate-layer 2s linear infinite;
      animation-delay: 1s;
    }

/* additional elements */
    .dot-1 {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%) rotate(0deg);
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background-color: #f8f8f2;
    }

.dot-1::before {
      content: "";
      position: absolute;
      top: 50%;
      left: 0;
      transform: translate(-50%, -50%);
      width: 20px;
      height: 2px;
      background-color: #f8f8f2;
      animation: animate-dot 2s linear infinite;
    }

.dot-2 {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%) rotate(0deg);
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background-color: #f8f8f2;
    }

.dot-2::before {
      content: "";
      position: absolute;
      top: 50%;
      left: 0;
      transform: translate(-50%, -50%);
      width: 20px;
      height: 2px;
      background-color: #f8f8f2;
      animation: animate-dot 2s linear infinite;
      animation-delay: 1s;
    }

/* animation functions */
    @keyframes animate-layer {
      0% {
        width: 0%;
      }
      100% {
        width: 100%;
      }
    }

@keyframes animate-dot {
      0% {
        transform: translate(-50%, -50%) rotate(0deg);
      }
      25% {
        transform: translate(-50%, -50%) rotate(45deg);
      }
      50% {
        transform: translate(-50%, -50%) rotate(0deg);
      }
      100% {
        transform: translate(-50%, -50%) rotate(0deg);
      }
    }

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