*{box-sizing:border-box;margin:0;padding:0}body{color:#222;background:#f5f7fa;padding:40px;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}#btn{cursor:pointer;border:10px;border-radius:5px;justify-self:center;width:250px;height:70px}#btn:hover{transform:scale(1.5)}#output{margin-top:100px}hr{margin-top:300px}