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Fonts are an important part of the publication. Your font selection should take into consideration both design and the targeted ranges of characters.

To use them in the customization CSS:

  • You can place the font files in the same folder as your CSS and use a @font-face definition to reference them.
  • You can use web fonts (for example, Google Fonts), and import the CSS snippet into your CSS.
  • You can use system fonts.
All these techniques are explained in: Oxygen PDF Chemistry User Manual: Fonts.

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Suppose that customization css, you have defined your font (for example, Roboto) using a Google web font:

@import url('https://fonts.googleapis.com/css?family=Roboto');

To use it in all the header parts:

@page {
  @top-left-corner { font-family: "Roboto"; }
  @top-left { font-family: "Roboto"; }
  @top-center { font-family: "Roboto"; }
  @top-right { font-family: "Roboto"; }
  @top-right-corner { font-family: "Roboto"; }
}

For the titles, match all the topic/title elements:

*[class ~= "topic/title"] {
  font-family: "Roboto";
}
For the content, you can match the root element of the document and set another font on it (for example, sans-serif). All elements will inherit this font.
:root {
  font-family: sans-serif;
}
As the title selector from the above example is more specific, it will take precedence over the selector that was used for content, thus the titles will preserve the Roboto font.

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For Asian languages, you must use a font or a sequence of fonts that cover the needed character ranges. If the characters are not found, the # symbol is used.

When you specify a sequence of fonts, if the glyphs are not found in the first font, the next font is selected until one that includes all the glyphs is found. A common font sequence for Asian languages is used in the following example.

In your customization css add:

:root {
  font-family: Calibri, SimSun, "Malgun Gothic";
}