flexboxの中央揃え2022-11-27cssdisplay: flex; justify-content: center; /* 主軸の中央揃え */ align-items: center; /* 交差軸の中央揃え*/ 参考https://developer.mozilla.org/ja/docs/Web/CSS/CSS_Flexible_Box_Layout/Basic_Concepts_of_Flexboxhttps://developer.mozilla.org/ja/docs/Web/CSS/align-itemshttps://developer.mozilla.org/ja/docs/Web/CSS/justify-content