:root{--base-top-buffer:24px;--base-bottom-buffer:18px;}
html,body{height:100%;overflow:hidden;user-select:none;touch-action:manipulation;background:#000}
.safe-top-spacer,.safe-bottom-spacer{position:fixed;left:0;right:0;z-index:3;pointer-events:none;background:transparent}
.safe-top-spacer{top:0;height:var(--base-top-buffer)}
.safe-bottom-spacer{bottom:0;height:calc(var(--base-bottom-buffer) + env(safe-area-inset-bottom))}