Drupal8でw3cssテーマ(theme)の初期フォントサイズ(font-size)設定が大き目になっているので、調整する必要があります。
Drupal8のw3cssテーマ設定画面(ホーム >> 管理 >> テーマ >> Appearance settings >> w3_css theme)では、フォント関連設定項目がないようで、cssスタイルで設定したほうが良いでしょう
h1{font-size:28px;}
h2{font-size:24px;}
h3{font-size:20px;}
h4{font-size:18px;}
h5{font-size:16px;}
h6{font-size:14px;}
h1, h1.w3-xxlarge{font-size:28px!important;}
h2{font-size:24px;}
h3{font-size:20px;}
h4{font-size:18px;}
h5{font-size:16px;}
h6{font-size:14px;}
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