.mobile-nav-close,.mobile-nav-backdrop{display:none}
@media(max-width:850px){
 .sidebar{overflow-y:auto}
 .mobile-nav-close{display:block;flex-shrink:0;margin:0 0 16px}
 .mobile-nav-backdrop:not([hidden]){display:block;position:fixed;inset:0;z-index:29;border:0;background:rgba(0,0,0,.55)}
}