@-webkit-keyframes pulse {
  0% {
    opacity: 0;
    background-position: center top;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
  10% {
    opacity: 0;
  }
  50% {
    opacity: 1;
    -moz-background-size: 75% auto;
    -o-background-size: 75% auto;
    -webkit-background-size: 75% auto;
    background-size: 75% auto;
  }
  90% {
    opacity: 0;
  }
  100% {
    opacity: 0;
    background-position: center bottom;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
}
@-moz-keyframes pulse {
  0% {
    opacity: 0;
    background-position: center top;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
  10% {
    opacity: 0;
  }
  50% {
    opacity: 1;
    -moz-background-size: 75% auto;
    -o-background-size: 75% auto;
    -webkit-background-size: 75% auto;
    background-size: 75% auto;
  }
  90% {
    opacity: 0;
  }
  100% {
    opacity: 0;
    background-position: center bottom;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
}
@-ms-keyframes pulse {
  0% {
    opacity: 0;
    background-position: center top;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
  10% {
    opacity: 0;
  }
  50% {
    opacity: 1;
    -moz-background-size: 75% auto;
    -o-background-size: 75% auto;
    -webkit-background-size: 75% auto;
    background-size: 75% auto;
  }
  90% {
    opacity: 0;
  }
  100% {
    opacity: 0;
    background-position: center bottom;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
}
@keyframes pulse {
  0% {
    opacity: 0;
    background-position: center top;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
  10% {
    opacity: 0;
  }
  50% {
    opacity: 1;
    -moz-background-size: 75% auto;
    -o-background-size: 75% auto;
    -webkit-background-size: 75% auto;
    background-size: 75% auto;
  }
  90% {
    opacity: 0;
  }
  100% {
    opacity: 0;
    background-position: center bottom;
    -moz-background-size: 0 auto;
    -o-background-size: 0 auto;
    -webkit-background-size: 0 auto;
    background-size: 0 auto;
  }
}


.scroll-down {
  
    border: 2px solid #fff;
    -moz-border-radius: 100px;
    -webkit-border-radius: 100px;
    border-radius: 100px;
    position: relative;
    left: 50%;
    top: 50%;
    width: 80px;
    height: 80px;
    /* margin-left: -50px; */
    margin: 0 0 0 -50px;
}
.scroll-down a {
  display: block;
  opacity: 0;
  -moz-border-radius: 100px;
  -webkit-border-radius: 100px;
  border-radius: 100px;
  -moz-transition: all 0.4s ease;
  -o-transition: all 0.4s ease;
  -webkit-transition: all 0.4s ease;
  transition: all 0.4s ease;
  line-height: 0;
  font-size: 0;
  color: transparent;
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  height: 100%;
  -moz-background-size: 0 auto;
  -o-background-size: 0 auto;
  -webkit-background-size: 0 auto;
  background-size: 0 auto;
  -webkit-animation: pulse 1.5s 0s infinite normal ease forwards;
  -moz-animation: pulse 1.5s 0s infinite normal ease forwards;
  -o-animation: pulse 1.5s 0s infinite normal ease forwards;
  animation: pulse 1.5s 0s infinite normal ease forwards;
  background-image: url("https://jamesmuspratt.com/codepen/img/arrow-down.svg");
  background-repeat: no-repeat;
}
.scroll-down a:before, .scroll-down a:after {
  content: " ";
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  height: 100%;
  background: url("https://jamesmuspratt.com/codepen/img/arrow-down.svg") no-repeat center top;
  -moz-background-size: 100% auto;
  -o-background-size: 100% auto;
  -webkit-background-size: 100% auto;
  background-size: 100% auto;
}
.scroll-down a:before {
  -webkit-animation: pulse 1.5s 0.25s infinite normal ease forwards;
  -moz-animation: pulse 1.5s 0.25s infinite normal ease forwards;
  -o-animation: pulse 1.5s 0.25s infinite normal ease forwards;
  animation: pulse 1.5s 0.25s infinite normal ease forwards;
}
.scroll-down a:after {
  -webkit-animation: pulse 1.5s 0.5s infinite normal ease forwards;
  -moz-animation: pulse 1.5s 0.5s infinite normal ease forwards;
  -o-animation: pulse 1.5s 0.5s infinite normal ease forwards;
  animation: pulse 1.5s 0.5s infinite normal ease forwards;
}
.scroll-down a:hover {
  background-color: rgba(0, 0, 0, 0.3);
}