@fatihsnsy;
Örneği inceleyip ilgili alanlarla oynayıp mantığı kavrayabilirsiniz.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style media="screen">
body{
position: fixed;
width: 100%;
height: 100vh;
margin: 0;
font-family: Arial,sans-serif;
}
#siteMenu{
position: relative;
width: 85%;
height: 50px;
margin: 0 auto;
background: #f45511;
border-radius: 10px;
top: 50%;
transform: translateY(-50%);
}
#siteMenu ul{
margin: 0;
padding: 0;
list-style: none;
}
#siteMenu ul li{
position: relative;
display: block;
line-height: 50px;
display: inline-block;
}
#siteMenu ul li a{
padding: 10px;
text-decoration: none;
color: #fff;
font-size: 16px;
}
#siteMenu ul li .subMenu{
position: absolute;
min-width: 200px;
top: 100%;
left: 0;
background: #f45511;
padding: 10px;
border-top: solid 2px white;
display: none;
}
#siteMenu ul li .subMenu li{
display: block;
}
#siteMenu ul li .subMenu li a{
font-size: 14px;
padding: 0;
}
#siteMenu ul li:hover .subMenu{
display: block;
}
</style>
</head>
<body>
<nav id="siteMenu">
<ul>
<li><a href="#">Menu 1</a></li>
<li>
<a href="#">Menu 1</a>
<ul class="subMenu">
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
</ul>
</li>
<li><a href="#">Menu 1</a></li>
<li><a href="#">Menu 1</a></li>
<li>
<a href="#">Menu 1</a>
<ul class="subMenu">
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
<li><a href="#">Submenu</a></li>
</ul>
</li>
<li><a href="#">Menu 1</a></li>
</ul>
</nav>
</body>
</html>