<label for="menuOn"> <input id="menuOn" type="checkbox"> <menu> <ul> <li><a href="#menu1">概要</a> <li><a href="#menu2">menu2</a> <li><a href="#menu3">menu3</a> <li><a href="#menu4">menu4</a> <li><a href="#menu5">menu5</a> <li><a href="#menu6">動作環境</a> <li><a href="#menu7">仕様</a> <li><a href="#menu8">免責事項</a> </ul> </menu> <div class="overlay"></div> </label> /* =====================================
![CSS3だけで作るクリックタイプのドロップダウンメニュー - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/375f47b76c0a9a12d373c7479665f45519c56ab1/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9Q1NTMyVFMyU4MSVBMCVFMyU4MSU5MSVFMyU4MSVBNyVFNCVCRCU5QyVFMyU4MiU4QiVFMyU4MiVBRiVFMyU4MyVBQSVFMyU4MyU4MyVFMyU4MiVBRiVFMyU4MiVCRiVFMyU4MiVBNCVFMyU4MyU5NyVFMyU4MSVBRSVFMyU4MyU4OSVFMyU4MyVBRCVFMyU4MyU4MyVFMyU4MyU5NyVFMyU4MyU4MCVFMyU4MiVBNiVFMyU4MyVCMyVFMyU4MyVBMSVFMyU4MyU4QiVFMyU4MyVBNSVFMyU4MyVCQyZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnM9MDZhOGNkOWE0YTIxNzIyNzdlMmRiMmU2NTRjNWE4NWU%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDA3Q0lUJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0zYTJkOGZjNmQ3YTE2MTk5NWRiZDJiODJjN2Q3ODE5NA%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3D74aaca38b16066ea30055d639b90a1de)