User:Chrs/bouncy.css

@keyframes x { from { left: 0; } }

@keyframes y { from { top: 0; } }

@keyframes x-ubox { from { left: 0; } to { left: calc(100vw - 240px); } }

@keyframes y-ubox { from { top: 0; } to { top: calc(100vh - 45px); } }