Ejemplo HTML de animación de esfera CSS

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

body {
      background-color: #181b23;
      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%;
      min-width: 100%;
      width: 100%;
      overflow-y: auto;
      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;
    }

.sphere {
      position: absolute;
      width: 150px;
      height: 150px;
      border-radius: 50%;
      opacity: 0;
      /* Transição suave para a aparência das esferas */
      transition: opacity 0.8s ease-in-out, transform 0.8s ease-in-out;
    }

.sphere:nth-child(1) {
      background-color:  #FF5858;
      animation: pulsing  2s ease-in-out infinite;
      animation-delay: 0s;
    }

.sphere:nth-child(2) {
      background-color: #80D8FF;
      animation: pulsing 2s ease-in-out infinite;
      animation-delay: 0.3s;
    }

.sphere:nth-child(3) {
      background-color:  #66D9EF; 
      animation: pulsing 2s ease-in-out infinite;
      animation-delay: 0.6s;
    }

@keyframes pulsing {
      0% {
        transform: scale(1);
        opacity: 0;
      }
      50% {
        transform: scale(1.15);
        opacity: 1;
       
      }
      100% {
        transform: scale(1);
        opacity: 0;
      }
    }

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