@import url(https://fonts.googleapis.com/css?family=Josefin+Sans:300,400);
* {
  margin: 0;
  padding: 0;
}
html, body {
  height: 100%;
}
section {
  position: relative;
  width: 100%;
  height: 100%;
}



.demo a {
  position: absolute;

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




#section10 a {
  padding-top: 60px;
}
#section10 a span {
  position: absolute;
  top: 0;
  left: 50%;
  width: 30px;
  height: 50px;
  margin-left: -15px;
  border: 2px solid black;
  border-radius: 50px;
  box-sizing: border-box;
}
#section10 a span::before {
  position: absolute;
  top: 10px;
  left: 50%;
  content: '';
  width: 6px;
  height: 6px;
  margin-left: -3px;
  background-color: black;
  border-radius: 100%;
  -webkit-animation: sdb10 2s infinite;
  animation: sdb10 2s infinite;
  box-sizing: border-box;
}
@-webkit-keyframes sdb10 {
  0% {
    -webkit-transform: translate(0, 0);
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  80% {
    -webkit-transform: translate(0, 20px);
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}
@keyframes sdb10 {
  0% {
    transform: translate(0, 0);
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  80% {
    transform: translate(0, 20px);
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}