Neon Animation

Denevola의 샌드박스 포털(초호기) » Neon Animation

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#header #header-extra-div-1 {
    animation: neon 1s ease-out infinite alternate;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background-position: center;
}
 
@keyframes neon {
  from {
    box-shadow: 0 0 10px white
  }
  to {
    box-shadow: none;
    opacity: .5;
  }
}