@keyframes flash{0%{outline:2px dashed transparent}50%{outline:2px dashed #666}to{outline:2px dashed transparent}}.flashing{animation:flash .5s infinite}.xy-pad{position:relative;width:100%;height:0;padding-bottom:100%;border:.2em solid #7F5AD5;overflow:hidden;cursor:crosshair;touch-action:none}.ball{position:absolute;width:3em;height:3em;background-color:#7f5ad5;border-radius:50%;transform:translate(-50%,-50%);pointer-events:none}