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border-top CSSプロパティで上側の境界線のスタイルを指定する
CSS border-top-style Property
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Learn CSS: How to set border and outline in HTML using CSS? - YouTube
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CSS how to: border-top - YouTube
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CSS | border-top-style Property - GeeksforGeeks
border-style - 枠線の種類を指定する | 日経クロステック（xTECH）
html - CSS - computed border color doesn't match actual border color - Stack Overflow
Css/Training/borders - W3C Wiki
