0.5边框

0.5px

&::before {
	content: " ";
	position: absolute;
	top: 0;
	left: 0;
	width: 200%;
	height: 200%;
	border-radius: 50%;
	border: 1px solid #ffffff;
	transform-origin: 0 0;
	transform: scale(0.5);
}

安全底部距离

padding-bottom: constant(safe-area-inset-bottom);
padding-bottom: env(safe-area-inset-bottom);