fix: 画面の横幅が600px以上のときにsidebarを閉じるボタンを非表示にするスタイルを追加
#75
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変更点
PCサイズの画面幅の環境において、ページの右上に位置している×ボタンは黄色のアラートを閉じるためのボタンのように見えますが、実際にはマークアップ上ではsidebarを閉じるためのボタンであり、#73 でsidebarの開閉のイベントを有効にしたことで、PCサイズの環境で意図しない挙動になってしまっていたため、画面の横幅が
600px以上のときに×ボタンの要素を非表示にする対応を行いました。確認事項
600px以上のときに×ボタンが表示されない