aspect-ratio | CSS-Tricks - CSS-Tricks
Full Browser Width Bars | CSS-Tricks - CSS-Tricks
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要素サイズとスクローリング
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CSSのwidth（幅）とheight（高さ）の指定方法をマスターしよう
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CSS】widthの使い方を覚えよう！ | うるチカラ
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CSSのwidth（幅）とheight（高さ）の指定方法をマスターしよう
CSS - How to do auto-resize an image to fit a div container-Learn in 30 Sec from Microsoft Awarded MVP
CSSのwidth（幅）とheight（高さ）の指定方法をマスターしよう
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flex-basis - CSS: Cascading Style Sheets | MDN
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Everything About Auto in CSS - Ahmad Shadeed
Width property in CSS Explained
What Does "width: 100%" Do in CSS?
