css制作滚动的小方块

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👇html代码：

<div class="boxLoading">

👇css代码：

  <style>
.boxLoading {
  width: 50px;
  height: 50px;
  margin: auto;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
}
.boxLoading:before {
  content: '';
  width: 50px;
  height: 5px;
  background: #000;
  opacity: 0.1;
  position: absolute;
  top: 59px;
  left: 0;
  border-radius: 50%;
  animation: shadow .5s linear infinite;
}
.boxLoading:after {
  content: '';
  width: 50px;
  height: 50px;
  background: #1A6844;
  animation: animate .5s linear infinite;
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 3px;
}
@keyframes animate {
  17% {
    border-bottom-right-radius: 3px;
  }
  25% {
    transform: translateY(9px) rotate(22.5deg);
  }
  50% {
    transform: translateY(18px) scale(1, 0.9) rotate(45deg);
    border-bottom-right-radius: 40px;
  }
  75% {
    transform: translateY(9px) rotate(67.5deg);
  }
  100% {
    transform: translateY(0) rotate(90deg);
  }
}
@keyframes shadow {
  0%,
  100% {
    transform: scale(1, 1);
  }
  50% {
    transform: scale(1.2, 1);
  }
}
body,
html {
  background: #ccc;
  overflow: hidden;
  height: 100%;
}

  </style>