.hover-border{display: inline-block;position: absolute;z-index: 100}
.left-right-border{height: 0;}
.left-border{ left: -1px;top: 0;}
.right-border{ right: -1px;bottom: 0px;}
.left-right-top-bottom-border{width: 0;}
.left-top-border{right: 50%;top: -1px;}
.left-bottom-border{left: 0px;bottom: -1px;}
.right-top-border{right: 0px;top: -1px;}
.right-bottom-border{left: 50%;bottom: -1px;}