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console 命令行工具 X clear

                    
>
console
<div class="loader">
    <div class="shadow"></div>
    <div class="box"></div>
</div>
body {
  background: #6997DB; 
  overflow: hidden;
}

.loader{
    position: absolute;
    top: calc(50% - 20px);
    left: calc(50% - 20px);
}

.box{
    height: 50px;
    width: 50px;
    background-color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 3px;
    animation: animate 0.5s linear infinite;
}

@keyframes animate{
    17% { border-bottom-right-radius: 3px; }
    25% { transform: translateY(9px) rotate(22.5deg); }
    50% {
    transform: translateY(18px) scale(1,.9) rotate(45deg) ;
    border-bottom-right-radius: 40px;
  }
  75% { transform: translateY(9px) rotate(67.5deg); }
  100% { transform: translateY(0) rotate(90deg); }
}

.shadow{
    width: 50px;
    height: 5px;
    background-color: #000;
    position: absolute;
    top: 59px;
    left: 0;
    border-radius: 50%;
    opacity: 0.1;
    animation: shadow 0.5s linear infinite;
}

@keyframes shadow{
  50% {
    transform: scale(1.2,1);
  }
}