回答編集履歴
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情報の追加。
test
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@@ -27,3 +27,59 @@
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【CSSのセレクタとは？覚えておきたい25種類と書き方】
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[https://saruwakakun.com/html-css/reference/selector](https://saruwakakun.com/html-css/reference/selector)
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---
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**追記：**
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記事本文の追記に対して。
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```CSS
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.wrapper:hover .logout:hover + .logout_pop{
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display: block;
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}
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```
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```HTML
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<div class="wrapper">
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<div class="effect"></div>
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<form class="" action="#" method="post">
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<span class="logout">
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<button class="logout_button" type="submit" name="logout" value="logout">
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<i class="fas fa-sign-out-alt"></i>
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</button>
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</span>
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<span class="logout_pop">ログアウト</span>
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</form>
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</div>
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```**動くサンプル：**[https://jsfiddle.net/05ybq2wz/](https://jsfiddle.net/05ybq2wz/)
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