<div class="selectWrap"> <select class="select" name="" id=""> <option value="">001</option> <option value="">002</option> <option value="">003</option> </select> </div> .selectWrap{ width: 100%; position: relative; display: inline-block; } .selectWrap::after { content: ''; width: 6px; height: 6px; border: 0px; border-bottom: solid 2px #b4b3b3; border-right: solid 2px #b4b3b3; -ms-transform: rotat
![cssだけでselectとシンプルな矢印 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/1b5f8e7c7f7481d16c6e2b6dd7f2ff7920a577f7/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-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9Y3NzJUUzJTgxJUEwJUUzJTgxJTkxJUUzJTgxJUE3c2VsZWN0JUUzJTgxJUE4JUUzJTgyJUI3JUUzJTgzJUIzJUUzJTgzJTk3JUUzJTgzJUFCJUUzJTgxJUFBJUU3JTlGJUEyJUU1JThEJUIwJnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmcz0xMmM1NDQ3Mzg0ZmY4ZGE4YzU1Zjc5MTVmMjY2MjM4Zg%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDB0YWtlc2hpLW5hZ2Fva2EmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT0zNiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPWNhOTU1NWQ2M2NmZWVjZjUxYWMzNjE0Yjk0Y2Q5MGM0%26blend-x%3D142%26blend-y%3D486%26blend-mode%3Dnormal%26s%3D2e7c99527780aebdb494ba37b8fab83b)