SOURCE

<div>
  这里放二维码图片
</div>

div {
	  width: 200px;
	  height: 200px;
	  position: relative;
      text-align: center;
      border:1px solid #ccc;
      line-height: 200px;
	}
	
	div::after {
	  content: '';
	  position: absolute;
	  left: 0px;
	  top: 0px;
	  width: 100%;
	  height: 1px;
	  background-color: #60e804;
	  -webkit-box-shadow: 0 0px 2px 4px rgba(96, 232, 4, 0.65);
	  box-shadow: 0 0px 6px 2px rgba(96, 232, 4, 0.65);
	  -webkit-animation: qrcode22 4s ease 0.7s infinite;
	  animation: qrcode22 4s ease 0.7s infinite;
	}
	
	@-webkit-keyframes qrcode22 {
	  0% {
	    opacity: 1;
	    filter: alpha(opacity=100);
	    top: 0px;
	  }
	  100% {
	    opacity: 1;
	    filter: alpha(opacity=100);
	    top: 100%;
	  }
	}
	
	@keyframes qrcode22 {
	  0% {
	    opacity: 1;
	    filter: alpha(opacity=100);
	    top: 0px;
	  }
	  100% {
	    opacity: 1;
	    filter: alpha(opacity=100);
	    top: 100%;
	  }
	}