こうかな?(違いそう)
HTML
1 <header>header</header>
2 <div class="wrapper">
3 <nav class="menu">
4 <ol>
5 <li>あいうえお<img src="1.png" alt="" /></li>
6 <li>かきくけこ<img src="2.png" alt="" /></li>
7 <li>さしすせそ<img src="3.png" alt="" /></li>
8 <li>たちつてと<img src="4.png" alt="" /></li>
9 <li>なにぬねの<img src="5.png" alt="" /></li>
10 </ol>
11 </nav>
12 <main>
13 <img src="a.png" alt="" />
14 </main>
15 </div>
CSS
1.wrapper {
2 display: flex;
3 position: relative;
4}
5
6.menu {
7 width: 200px;
8}
9
10.menu li img {
11 display: none;
12}
13
14.menu li:hover img {
15 display: inline-block;
16 z-index: 2;
17}
18
19.menu li img,
20main img {
21 position: absolute;
22 left: 220px;
23 top: 20px;
24 width: 640px;
25 height: 400px;
26 border: 1px solid #5b9bd5;
27 background: #5b9bd5;
28}