.scrolldemo #ScrollArrow {
  position: absolute;
  bottom: 20px;
  left: 50%;
  z-index: 1200;
  display: inline-block;
  -webkit-transform: translate(0, -50%);
  transform: translate(0, -50%);
  color: #fff;
  letter-spacing: .1em;
  text-decoration: none;
  transition: opacity .3s;
}
.scrolldemo #ScrollArrow:hover {
  opacity: .5;
}

#section10 #ScrollArrow {
  padding-top: 60px;
  padding-bottom: 20px;
}
#section10 #ScrollArrow span {
  position: absolute;
  top: 0;
  left: 50%;
  width: 30px;
  height: 50px;
  margin-left: -15px;
  border: 2px solid #fff;
  border-radius: 50px;
  box-sizing: border-box;
}
#section10 #ScrollArrow span::before {
  position: absolute;
  top: 10px;
  left: 50%;
  content: '';
  width: 6px;
  height: 6px;
  margin-left: -3px;
  background-color: #fff;
  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;
  }
}