Botón y capa animados CSS

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HTML

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #18202C;
  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;
}

.button {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: #8c8c8c; /* Cor de fundo */
  position: relative;
  animation: buttonLoop 1s linear infinite;
}

@keyframes buttonLoop {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

.layer1 { /*  A primeira camada: um clique e a sombra se movem */
  width: 200px;
  height: 200px;
  background-color: rgba(255,255,255,0.1);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  animation: layerPulse 1s ease-in-out infinite;
}

@keyframes layerPulse {
  0% {
    transform: scale(1);
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
  }
  50% {
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(255,255,255,0.8);
  }
  100% { 
    transform: scale(1);
    box-shadow: 0 0 10px rgba(255,255,255,0.5);
  }
}