border-style - 枠線の種類を指定する | 日経クロステック（xTECH）
HTML Ref » Reference » Appendix B » border properties
border HTML要素の境界線を指定するCSSプロパティの書き方
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HTML】borderで枠線のスタイルや太さをカスタマイズする方法まとめ | ポテパンスタイル
