回答編集履歴
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別の方法を追記
test
CHANGED
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@@ -47,3 +47,45 @@
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}
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```
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# 別の方法を追記
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ヘッダに`height: max-content`を当てて、内容物をオーバーフローさせれば、絶対配置を使う必要もなくていい感じですね。
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[サンプル](https://jsfiddle.net/Lhankor_Mhy/Lgy15kw7/2/)
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```css
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header{
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width: 0;
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height: max-content;
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position: sticky;
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opacity: 0.5;
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top: 0;
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}
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header ul{
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width: max-content;
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background: pink;
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}
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```
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