<div class="cp_arrows">
  <div class="cp_arrow"></div>
  <div class="cp_arrow"></div>
  <div class="cp_arrow"></div>
</div>

.cp_arrows {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.cp_arrows .cp_arrow {/*矢印を配置するベースの設定*/
  position: absolute;
  width: 60px;
  height: 10px;
  opacity: 0;/*スタートは透明*/
  transform: scale(0.3);/*スタートは30%に縮小*/
  animation: arrow-move07 3s ease-out infinite;
}
.cp_arrows .cp_arrow:first-child {/*1秒ずらしてアニメーション*/
  animation: arrow-move07 3s ease-out 1s infinite;
}
.cp_arrows .cp_arrow:nth-child(2) {/*2秒ずらしてアニメーション*/
  animation: arrow-move07 3s ease-out 2s infinite;
}
.cp_arrows .cp_arrow:before,
.cp_arrows .cp_arrow:after {/*矢印全体の設定*/
  position: absolute;
  content: '';
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 100%;
  background: #2196f3;
  border-radius: 2px;
}
.cp_arrows .cp_arrow:before {/*矢印左の線の位置と傾斜*/
  left: 1px;
  transform: skewY(30deg);
}
.cp_arrows .cp_arrow:after {/*矢印左の線の位置と傾斜*/
  right: 1px;
  transform: skewY(-30deg);
}
@keyframes arrow-move07 {
   25% { opacity: 0.6;}
   43% { transform: translateY(1em); opacity: 0.8;}
   62% { transform: translateY(2em); opacity: 1;}
  100% { transform: translateY(3em) scale(0.5); opacity: 0;}
}