<nav class="menu">
<ul>
<li>
<a href="#">1메뉴 1</a>
<ul>
<li><a href="">2메뉴 1</a></li>
<li><a href="">2메뉴 2</a></li>
<li><a href="">2메뉴 3</a></li>
</ul>
</li>
<li>
<a href="#">1메뉴 2</a>
<ul>
<li><a href="">2메뉴 1</a></li>
<li><a href="">2메뉴 2</a></li>
<li><a href="">2메뉴 3</a></li>
</ul>
</li>
<li>
<a href="#">1메뉴 3</a>
<ul>
<li><a href="">2메뉴 1</a></li>
<li><a href="">2메뉴 2</a></li>
<li><a href="">2메뉴 3</a></li>
</ul>
</li>
</ul>
</nav>
a{
text-decoration: none;
color: inherit;
}
li{
width: 100px;
background-color: beige;
}
.menu{
text-align: center;
}
ul{
list-style: none;
padding: 0;
margin: 0;
}
.menu> ul>li{
position: relative;
display: block;
}
.menu > ul > li > ul{
position: absolute;
display: none;
}
.menu> ul>li:hover > ul{
display: inline-block;
/* display: block; */
}
a{
text-decoration: none;
color: inherit;
}
li{
width: 100px;
height: 50px;
background-color: beige;
align-content: center;
}
.menu{
text-align: center;
}
ul{
list-style: none;
padding: 0;
margin: 0;
}
.menu> ul>li{
position: relative;
display: block;
}
.menu > ul > li > ul{
position: absolute;
display: none;
left: 100%;
top: 0;
}
.menu> ul>li:hover > ul{
display: inline-block;
/* display: block; */
}
<style>
.wrap{
height: 600px;
width: 80%;
margin: 0 auto;
border: 1px solid #000;
}
nav{
height: 200px;
background-color: aqua;
align-content: end;
position: relative;
}
main{
height: 400px;
background-color: red;
position: relative;
z-index: -2;
}
a{
color: inherit;
text-decoration: none;
}
ul{
padding: 0;
list-style: none;
margin: 0;
}
.menu{
width: 300px;
height: 40px;
background-color: blue;
display: flex;
margin-left: auto;
}
.menu > li{
width: calc(100% / 3);
}
.menu > li a{
width: 100%;
height: 40px;
align-content: center;
text-align: center;
display: inline-block;
background-color: #fff;
}
.submenu{
display: none;
}
.menu > .o{
height: 200px;
background-color: blue;
position: absolute;
z-index: -1;
width: 100%;
left: 0;
top: 100%;
display: none;
}
.menu:hover .submenu, .menu:hover .o{
display: block;
}
</style>
<body>
<div class="wrap">
<nav>
<ul class="menu">
<li><a href="">메뉴1</a>
<ul class="submenu">
<li><a href="">세부1</a></li>
<li><a href="">세부2</a></li>
<li><a href="">세부3</a></li>
</ul>
</li>
<li><a href="">메뉴1</a>
<ul class="submenu">
<li><a href="">세부1</a></li>
<li><a href="">세부2</a></li>
<li><a href="">세부3</a></li>
</ul>
</li>
<li><a href="">메뉴1</a>
<ul class="submenu">
<li><a href="">세부1</a></li>
<li><a href="">세부2</a></li>
<li><a href="">세부3</a></li>
</ul>
</li>
<div class="o"></div>
</ul>
</nav>
<main></main>
</div>
</body>