Is there a way to alter the font size for the title and tabs when utilizing a bslib theme?

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Yes, you can use custom CSS to alter the font size for the title and tabs when using a bslib theme. Here's an example:

```{css} /* Change font size of title */ .bs-header .navbar-brand { font-size: 2rem; }

/* Change font size of tabs */ .nav-item { font-size: 1.2rem; }

You can include this CSS code in your R Markdown document using the `css` chunk option:

```{css, echo=FALSE}
/* CSS code here */

Alternatively, you can create a separate CSS file and link to it in your document's YAML header:

output:
  html_document:
    theme: bootswatch::yeti
    css: styles.css

In this case, the CSS code would be in the "styles.css" file.