<body className="relative">
<footer className="absolute bottom-0 left-0 h-14">sssdsd </footer>
<body>
main div : backdrop-blur-sm shadaw-sm bg-white/75, dark:bg-slate-900 border-b, border-slate-300, dark:border-slate-700 fixed, top-0, left-0, z-60, h-20 flex, items-centre, justify-between,
sub div : container ,max-w-7xl (1280px, 80rem) ,mx-auto ,w-full , flex, items-centre, justify-between,
Some classes : ring classes disabled : opacity-50, pointer-events-none transition-color outline
<header class="main container>
<nav class="sub container">
<logo />
<div class="md: hidden">
//invisible for medium to large screens.
<ThemeToggle />
</div>
<div class="hidden md:flex gap-4">
//invisible for small screens.
<ThemeToggle />
<content what you want >
{session ?( link component and <signOutButton />) : <signInButton />}
</div>
</nav>
</header>