Ejemplo de contenedor de animación CSS

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HTML

CSS

* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background-color: #1a1a1a;
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
      overflow: hidden;
    }
    .codigo {
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      background: #222;
      color: #eee;
      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%);
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      height: 50%;
      overflow: hidden;
      background: transparent;
    }
    .el1 {
      position: absolute;
      width: 200px;
      height: 200px;
      background: #F8F8F2;
      border-radius: 50%;
      transform-origin: center;
      animation: pulse 2s infinite alternate;
    }
    @keyframes pulse {
      0% { transform: scale(1); }
      50% { transform: scale(1.1); }
      100% { transform: scale(1); }
    }
    .el2 {
      position: absolute;
      width: 150px;
      height: 150px;
      background: #272822;
      clip-path: polygon(50% 0%, 100% 100%, 0% 100%, 50% 50%);
      transform-origin: center;
      animation: rotate-and-expand 4s infinite;
      animation-delay: 1s;
    }
    @keyframes rotate-and-expand {
      0% { transform: rotate(0deg) scale(1); }
      25% { transform: rotate(45deg) scale(1.2); }
      50% { transform: rotate(90deg) scale(0.9); }
      75% { transform: rotate(135deg) scale(1.1); }
      100% { transform: rotate(180deg) scale(1); }
    }
    .el3 {
      position: absolute;
      width: 320px;
      height: 100px;
      background: linear-gradient(to right, #66D9EF, #16BDF8);
      border-radius: 10px;
      opacity: 0;
      animation: fade-in-out 3s infinite;
      animation-delay: 2s;
    }
    @keyframes fade-in-out {
      0% { opacity: 0; }
      50% { opacity: 1; }
      100% { opacity: 0; }
    }