.btn{
  font-family: "微软雅黑";
  font-weight:650;
  font-size: 20px;
  margin: 20px auto;

  padding: 10px 100px 10px 100px;
  color: #222;
  border: none;
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.85);
  background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#fff), to(#aaa));
  background: -ms-linear-gradient(right, #fff 0%, #ddd 100%);
  -ms-filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff', endColorstr='#ddd', GradientType=0);
  -webkit-background-color: linear-gradient(to right, #fff, #0ff);
  -webkit-border-radius: 23px;
  -moz-border-radius: 23px;
  -o-border-radius: 23px;
  border-radius: 23px;
  -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  -moz-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

@-webkit-keyframes pulse {
  0% {
    -webkit-box-shadow: 0 0 12px rgba(51, 204, 255, 0.2);
  }
  50% {
    -webkit-box-shadow: 0 0 12px rgba(51, 204, 255, 0.9);
  }
  100% {
    -webkit-box-shadow: 0 0 12px rgba(51, 204, 255, 0.2);
  }
}

.btn:hover,
.btn:focus {
  cursor: pointer;
  color: #000;
  -webkit-animation: pulse 3s infinite ease-in-out;
  transition: all 0.5s ease-in-out;
  -webkit-box-shadow: 0 3px 5px rgba(0, 0, 0, 0.7);
  -moz-box-shadow: 0 3px 5px rgba(0, 0, 0, 0.7);
  box-shadow: 0 3px 5px rgba(0, 0, 0, 0.7);
}