.entry-content.hatenablog-entry .column { flex: 1; min-width: 300px; } .entry-content.hatenablog-entry .section { background-color: white; border-radius: 8px; padding: 25px; margin-bottom: 30px; box-shadow: 0 2px 4px rgba(0,0,0,0.05); border-top: 5px solid #00897B; /* トップボーダーを追加 */ } .entry-content.…