在您_output.yml添加 css 文件名
bookdown::gitbook:
css: style.css
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创建style.css更改默认300px
.book .book-summary {
width: 350px;
position:absolute;
top:0;
left:-350px;
}
.book.with-summary .book-header.fixed {
left: 350px;
}
.book.with-summary .book-body {
left: 350px;
}
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