Fragmento de código de animación de corazón CSS

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Fragmento de código de animación de corazón CSS

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HTML

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #171923;
  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;
}
.elemento { 
  position:relative;
    width: 200px;
    height: 200px;
    border-radius: 100%;
    transform-origin: 50% 50%;
    animation: pulsa 2s infinite alternate; }

.elemento > .heart {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, #f6767b 0%, #a878ab 50%, #a878ab 100%);
    background-color: #f6767b; filter: drop-shadow(2px 2px 8px rgba(0,0,0,0.6));
opacity: 0.7;

animation-delay: var(--delay);
}
@keyframes pulsa {
  0% {
    transform: scale(1) ;
  }
  50% {
    transform: scale(1.2);
    filter:contrast(1.5);
    opacity: 0.9
  }
  100% {
    transform: scale(1);
   filter: contrast(1);
    opacity: 0.7;
}};

.elemento:nth-child(1)  { animation: pulsa 1s linear infinite alternate}
.elemento:nth-child(2)  { animation: pulsa 1.5s ease-in-out infinite alternate}
.elemento:nth-child(3)  { animation: pulsa 2s ease-in infinite alternate}

.elemento:nth-child(1) > .heart { --delay: "0s";}

.elemento:nth-child(2) > .heart { --delay: "0.5s";}
.elemento:nth-child(3) > .heart { --delay: "1s";}