htmlのheadに、以下のmetaタグが抜けていないかチェック。
<meta name="viewport" content="width=device-width, initial-scale=1.0">
PC上でブラウザの幅を動かすと正常に表示が切り替わってる場合でもスマホから見ると切り替わってない場合があるので注意！
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