.arrows {
  width: 60px;
  height: 52px;
  position: absolute;
  left: 50%;
  margin-left: -30px;
  bottom: 10px;
}

.arrows path {
  stroke: #b60606;
  fill: transparent;
  stroke-width: 1.5px;
  animation: arrow 1.5s infinite;
  -webkit-animation: arrow 1.5s infinite;
}

@keyframes arrow {
  0% {
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

@-webkit-keyframes arrow /*Safari and Chrome*/ {
  0% {
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  80% {
    opacity: 0;
  }
  100% {
    opacity: 0;
  }
}

.arrows path.a1 {
  animation-delay: -0.5s;
  -webkit-animation-delay: -0.5s; /* Safari 和 Chrome */
}

.arrows path.a2 {
  animation-delay: -0.25s;
  -webkit-animation-delay: -0.25s; /* Safari 和 Chrome */
}

.arrows path.a3 {
  animation-delay: 0s;
  -webkit-animation-delay: 0s; /* Safari 和 Chrome */
}