* {
  margin: 0;
  padding: 0;
}

/*body {*/
/*  background: #000;*/
/*}*/

.bilibiliYEAH {
  text-decoration: none;
  position: fixed;
  left: 27.5%;
  bottom: 2.5%;
  /* 居中 */
  transform: translate(-50%, -50%);
  font-size: 36px;
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
  background-size: 400%;
  width: 400px;
  height: 100px;
  color: #ffffff;
  line-height: 100px;
  text-align: center;
  text-transform: uppercase;
  border-radius: 50px;
  z-index: 1;
}

.bilibiliYEAH::before {
  content: "";
  position: fixed;
  left: -5px;
  right: -5px;
  top: -5px;
  bottom: -5px;
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
  background-size: 400%;
  border-radius: 50px;
  filter: blur(20px);
  z-index: -1;
}

.bilibiliYEAH:hover::before {
  animation: sun 8s infinite;
}

.bilibiliYEAH:hover {
  animation: sun 8s infinite;
}

@keyframes sun {
  100% {
    background-position: -400% 0;
  }
}