.body {
  background: #ee9700;
  position: relative;
}
.body .guide_area {
  width: 100%;
  height: 2rem;
  position: absolute;
  bottom: 0;
  left: 0;
}
.body .arrow {
  position: absolute;
  left: 14%;
  bottom: 30%;
  width: 5%;
  animation: guide 1s infinite linear;
  -webkit-animation: guide 1s infinite linear;
}
@keyframes guide {
  0% {
    opacity: 1;
    bottom: 29%;
  }
  100% {
    opacity: 0.1;
    bottom: 35%;
  }
}
@-webkit-keyframes guide {
  0% {
    opacity: 1;
    bottom: 29%;
  }
  100% {
    opacity: 0.1;
    bottom: 35%;
  }
}