.border-box-1{position:relative;width:100%;height:100%}.border-box-1 .border{position:absolute;display:block}.border-box-1 .right-top{right:0;transform:rotateY(180deg)}.border-box-1 .left-bottom{bottom:0;transform:rotateX(180deg)}.border-box-1 .right-bottom{right:0;bottom:0;transform:rotateX(180deg) rotateY(180deg)}.border-box-1 .border-box-content{position:relative;width:100%;height:100%}