CSS
display
https://saruwakakun.com/html-css/basic/display
<li>
https://vanillaice000.blog.fc2.com/blog-entry-795.html
https://qiita.com/Mia01/items/72c631c91a95b7d4cef2
https://www.tnjapan.net/6978/
HTML&CSS
HTML
HTML
HTML