harisheidiko

.box{
	position:relative;background-color:#f1f1f1;
	width:300px;height:300px;
	margin:80px auto;z-index:3;}
.box:before{
	content:'';position:absolute;
	left:0;top:0;bottom:0;right:0;
	border:2px solid red;margin:-20px;z-index:-1;		
	clip:rect(0,100px,50px,10px);
	animation:lineA 8s linear infinite;}