safe area

<meta name="viewport" content="viewport-fit=cover" />

body {
    padding-top: constant(safe-area-inset-top);   //为导航栏+状态栏的高度 88px            
    padding-left: constant(safe-area-inset-left);   //如果未竖屏时为0                
    padding-right: constant(safe-area-inset-right); //如果未竖屏时为0                
    padding-bottom: constant(safe-area-inset-bottom);//为底下圆弧的高度 34px       
}