/*流光溢彩*/
.btn-1 {
  position: relative;
  outline: none;
  cursor: pointer;
}
.btn-1:first-child:hover {
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
  background-size: 400%;
}
.btn-1:last-child:hover {
  background: linear-gradient(90deg, #fa7199, #f5ce62, #e43603, #fa7199);
  background-size: 400%;
}
.btn-1:first-child:before,
.btn-1:last-child:before {
  content: '';
  position: absolute;
  background: inherit;
  top: -5px;
  right: -5px;
  bottom: -5px;
  left: -5px;
  border-radius: 50px;
  filter: blur(20px);
  opacity: 0;
  transition: opacity 0.5s;
}
.btn-1:first-child:hover:before,
.btn-1:last-child:hover:before {
  opacity: 1;
  z-index: -1;
}
.btn-1:hover {
  z-index: 1;
  animation: glow 8s linear infinite;
}