.bird{z-index:20;pointer-events:none;will-change:transform;transform-origin:50%;filter:drop-shadow(0 6px 6px #2a24102e);position:fixed;top:0;left:0}.bird img{-webkit-user-select:none;user-select:none;transform-origin:50% 100%;width:auto;display:block}.bird-flap{animation:.17s ease-in-out infinite alternate bird-flap}@keyframes bird-flap{0%{transform:scaleY(1)rotate(-1.5deg)}to{transform:scaleY(.9)rotate(1.5deg)}}