CSS DİKEY AÇILIR MENÜ

HTML

	<nav>
		<ul>
			<li><a href=""> Anasayfa</a></li>
			<li><a href=""> Hakkımızda</a></li>
			<li><a href=""> Ürünler <i class="fa fa-chevron-right"></i></a>
				<div>
					<ul>
						<li><a href=""> Hosting</a> </li>
						<li><a href=""> Domain</a> </li>
						<li><a href=""> Server</a> </li>
						<li><a href="">SSL</a> </li>
					</ul>
				</div>
			</li>  
			<li><a href=""> İletişim</a></li>
		</ul>
	</nav>
	<p>
		Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
		tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
		quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
		consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
		cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
		proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
	</p>

CSS

* {
			margin:0; 
			padding: 0;
			box-sizing:border-box;
		}

		body {	
			background-image: linear-gradient(#da3d00,#000);
			font-family:calibri;
			display: flex;

		}
		
		nav {
			width:40%;
			color:#fff; 
			background-color: #000;
			padding: 3rem; 
		}
		nav ul {
			list-style-type: none;

		}
		nav ul li { position: relative; }
		nav ul li a { 
			display: block;
			margin:1rem 0;
			text-decoration: none;
			color:#fff;
			font-size: 1.5rem;
			padding: .5rem 1rem;
			border-radius: 1rem;
		}
		nav ul li a:hover { background-color: #da3d00; }
		nav ul li a i { font-size:1rem!important }


		/*alt menü (acılır) */
		nav ul li div {
			display:none; 
			padding-left:1rem; 
			position:absolute;
			top:0;
			left:100%;

		}
		nav ul li:hover div {display:block;} 
		nav ul li div ul {
			background-color: #da3d00;
			border-radius: 1rem;
			flex-direction:column;
			gap:1rem; 
			padding:1rem;
		}		
		nav ul li div ul a { margin:0 } 
		nav ul li div ul a:hover  { color: #000; } 

		/* sayfa yazısı */
		p {
			color:#fff;
			margin-top:3rem;
			padding: 4rem;
			font-size: 2rem;
			text-align: center;
		}

		@media (max-width:768px) {
			html {font-size: 10px}
		}