.rolling-border-box{position:absolute;box-sizing:border-box;overflow:hidden}.rolling-border-box div{position:absolute;border:solid 0 rgba(255,0,0,.5);height:50%;width:50%;animation:leftToRight 1s infinite linear;box-sizing:border-box}.rolling-border-box .rolling-border-line-1{border-top-width:2px;height:0;animation-name:rollingLeftToRight}.rolling-border-box .rolling-border-line-3{border-top-width:2px;height:0;bottom:0;animation-name:rollingRightToLeft}.rolling-border-box .rolling-border-line-2{border-left-width:2px;width:0;bottom:-100%;animation-name:rollingBottomToTop;animation-delay:.5s}.rolling-border-box .rolling-border-line-4{border-left-width:2px;width:0;right:0;top:-100%;animation-name:rollingTopToBottom;animation-delay:.5s}