@import url(https://fonts.googleapis.com/css?family=Josefin+Sans:300,400);

.demo a {
  position: relative;
  bottom: 50px;
  left: 45%;
  z-index: 2;
  display: inline-block;
  -webkit-transform: translate(0, -50%);
  transform: translate(0, -50%);
  color: #fff;
  font : normal 400 20px/1 'Josefin Sans', sans-serif;
  letter-spacing: .1em;
  text-decoration: none;
  transition: opacity .3s;
}
.demo a:hover {
  opacity: .5;
}

#section03 a {
  padding-top: 60px;
}
#section03 a span {
  position: absolute;
  top: 0;
  left: 50%;
  width: 46px;
  height: 46px;
  margin-left: -23px;
  border: 1px solid #fff;
  border-radius: 100%;
  box-sizing: border-box;
}
#section03 a span::after {
  position: absolute;
  top: 50%;
  left: 50%;
  content: '';
  width: 16px;
  height: 16px;
  margin: -12px 0 0 -8px;
  border-left: 1px solid #fff;
  border-bottom: 1px solid #fff;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
  box-sizing: border-box;
}
#section03 a span::before {
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
  content: '';
  width: 44px;
  height: 44px;
  box-shadow: 0 0 0 0 rgba(255,255,255,.1);
  border-radius: 100%;
  opacity: 0;
  -webkit-animation: sdb03 3s infinite;
  animation: sdb03 3s infinite;
  box-sizing: border-box;
}
@-webkit-keyframes sdb03 {
  0% {
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  60% {
    box-shadow: 0 0 0 60px rgba(255,255,255,.1);
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes sdb03 {
  0% {
    opacity: 0;
  }
  30% {
    opacity: 1;
  }
  60% {
    box-shadow: 0 0 0 60px rgba(255,255,255,.1);
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}