Trecho HTML de animação de círculo CSS

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* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #181B27;
  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: 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;
}

.container {
  position: relative;
  width: 100%;
  height: 100%;
}

.circle {
  position: absolute;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background-color: #FFD700; /* Cor amarelo ouro */
  animation: fadeInOut 3s infinite alternate;
}

.circle:nth-child(1) {
  left: 50px;
  top: 50px;
  animation-delay: 0s;
}

.circle:nth-child(2) {
  left: 150px;
  top: 150px;
  animation-delay: 0.5s;
}

.circle:nth-child(3) {
  left: 250px;
  top: 50px;
  animation-delay: 1s;
}

.circle:nth-child(4) {
  left: 50px;
  top: 250px;
  animation-delay: 1.5s;
}

@keyframes fadeInOut {
  0% {
    opacity: 1;
  }
  50% {
    opacity: 0.1;  
  }
  100% {
    opacity: 1;
  }
}

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