2015-08-06 02:36:21 +08:00
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# Theme
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2018-08-03 10:34:26 +08:00
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The default renderer uses a [handlebars](http://handlebarsjs.com/) template to
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render your markdown files and comes with a default theme included in the mdBook
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binary.
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2015-08-06 02:36:21 +08:00
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2018-08-03 10:34:26 +08:00
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The theme is totally customizable, you can selectively replace every file from
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the theme by your own by adding a `theme` directory next to `src` folder in your
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project root. Create a new file with the name of the file you want to override
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2015-08-06 02:36:21 +08:00
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and now that file will be used instead of the default file.
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2015-12-30 22:04:24 +08:00
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Here are the files you can override:
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2015-08-06 02:36:21 +08:00
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2020-05-10 15:31:30 +08:00
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- **_index.hbs_** is the handlebars template.
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- **_head.hbs_** is appended to the HTML `<head>` section
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2020-05-10 15:35:27 +08:00
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- **_header.hbs_** content is appended on top of every book page
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2020-05-10 15:31:30 +08:00
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- **_book.css_** is the style used in the output. If you want to change the
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2018-08-03 10:34:26 +08:00
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design of your book, this is probably the file you want to modify. Sometimes
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in conjunction with `index.hbs` when you want to radically change the layout.
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2020-05-10 15:31:30 +08:00
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- **_book.js_** is mostly used to add client side functionality, like hiding /
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2018-08-03 10:34:26 +08:00
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un-hiding the sidebar, changing the theme, ...
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2020-05-10 15:31:30 +08:00
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- **_highlight.js_** is the JavaScript that is used to highlight code snippets,
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you should not need to modify this.
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- **_highlight.css_** is the theme used for the code highlighting
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- **_favicon.png_** the favicon that will be used
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2015-08-06 02:36:21 +08:00
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2018-08-03 10:34:26 +08:00
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Generally, when you want to tweak the theme, you don't need to override all the
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files. If you only need changes in the stylesheet, there is no point in
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overriding all the other files. Because custom files take precedence over
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built-in ones, they will not get updated with new fixes / features.
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2015-12-30 22:04:24 +08:00
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2018-08-03 10:34:26 +08:00
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**Note:** When you override a file, it is possible that you break some
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functionality. Therefore I recommend to use the file from the default theme as
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template and only add / modify what you need. You can copy the default theme
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into your source directory automatically by using `mdbook init --theme` just
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remove the files you don't want to override.
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