Botón animado con CSS

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HTML

CSS

body{
  background: linear-gradient(to right, #000000, #1d04ab);
}
.btn {
  position: relative;
  display: inline-block;
  padding: 20px 30px;
  color: #b79726;
  font-size: 16px;
  text-decoration: none;
  text-transform: uppercase;
  overflow: hidden;
  transition: .5s;
  margin-top: 40px;
  letter-spacing: 4px;
  background: transparent;
  border: none;
  cursor: pointer;
}
.btn:hover {
  background: #f49803;
  color: #fff;
  border-radius: 5px;
  box-shadow: 0 0 5px #f4c803,
              0 0 25px #bd9d0b,
              0 0 50px #f4e403,
              0 0 100px #d5cf1e;
}
.btn span {
  position: absolute;
  display: block;
}
.btn span:nth-child(1) {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #f4c003);
  animation: btn-anim1 1s linear infinite;
}
@keyframes btn-anim1 {
  0% {
    left: -100%;
  }
  50%,100% {
    left: 100%;
  }
}
.btn span:nth-child(2) {
  top: -100%;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, #f4bc03);
  animation: btn-anim2 1s linear infinite;
  animation-delay: .25s
}
@keyframes btn-anim2 {
  0% {
    top: -100%;
  }
  50%,100% {
    top: 100%;
  }
}
.btn span:nth-child(3) {
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(270deg, transparent, #f4dc03);
  animation: btn-anim3 1s linear infinite;
  animation-delay: .5s
}
@keyframes btn-anim3 {
  0% {
    right: -100%;
  }
  50%,100% {
    right: 100%;
  }
}
.btn span:nth-child(4) {
  bottom: -100%;
  left: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(360deg, transparent, #f4b003);
  animation: btn-anim4 1s linear infinite;
  animation-delay: .75s
}
@keyframes btn-anim4 {
  0% {
    bottom: -100%;
  }
  50%,100% {
    bottom: 100%;
  }
}