a.button {
  width: auto;
  display: inline-block;
  cursor: pointer;
  outline: 0;
  margin: 0 auto;
  -webkit-animation: greenPulse 2s infinite;
  animation: greenPulse 2s infinite;
  -webkit-animation-delay: 0s;
  animation-delay: 0s;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
  padding: 20px 50px;
  border-radius: 50px;
  color: #ffffff;
  font-size: 18px;
  letter-spacing: 1px;
  background: #00000040;

    -webkit-transition: all linear .218s;
    -moz-transition: all linear .218s;
    transition: all linear .218s;
}
a.button:hover{
     background: #ff006a8c;
}
@-webkit-keyframes greenPulse {
  0% {  -webkit-box-shadow: 0 0 10px #ffffff; box-shadow: 0 0 10px #ffffff;}
  10% { -webkit-box-shadow: 0 0 15px #ffffff;box-shadow: 0 0 15px #ffffff; }
  20% { -webkit-box-shadow: 0 0 25px #ffffff;box-shadow: 0 0 25px #ffffff; }
  30% { -webkit-box-shadow: 0 0 35px #ffffff;box-shadow: 0 0 35px #ffffff; }
  40% { -webkit-box-shadow: 0 0 45px #ffffff;box-shadow: 0 0 45px #ffffff; }
  50% { -webkit-box-shadow: 0 0 55px #ffffff;box-shadow: 0 0 55px #ffffff; }
  60% { -webkit-box-shadow: 0 0 45px #ffffff;box-shadow: 0 0 45px #ffffff; }
  70% { -webkit-box-shadow: 0 0 35px #ffffff;box-shadow: 0 0 35px #ffffff; }
  80% { -webkit-box-shadow: 0 0 25px #ffffff;box-shadow: 0 0 25px #ffffff; }
  90% { -webkit-box-shadow: 0 0 15px #ffffff;box-shadow: 0 0 15px #ffffff; }
  100% {-webkit-box-shadow: 0 0 10px #ffffff;box-shadow: 0 0 10px #ffffff;  }
}