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コピー時に改行が消える問題を修正 .code-line { counter-increment: linenumber; /*code-lineクラスの数でカウント*/ } .code-line:nth-child(even){ background-color: #E8E9F2; /*偶数行のみ背景色を適用*/ } .code-line::before { content: counter(line…