How to change font size for code chunks in Quarto?

Question

I am using quarto to prepare a Beamer presentation. I would like to reduce the font size of the code inside a given chunk so everything fits better. See the example below:

The code that generates the chunk is:

```{python}
# Import packages
import numpy as np
```

```{python}
#| echo: true
w = np.array([0.7, 0.3])
Sigma = np.array([[0.09, 0.1], [0.1, 0.25]])

var_rp = w.T @ Sigma @ w
print("Variance of our example portfolio {:.4f}".format(var_rp))
print("Standard Deviation of our example portfolio {:.2f}".format(np.sqrt(var_rp)))
```

Is there a way to change the font size of this chunk so all lines of code fit in a single line in the pdf? Thanks in advance!

Answer 1

You can use \AddToHookNext{env/Highlighting/begin}{\tiny} to change the font size of the next chunk without affecting other chunks:

---
format: beamer
---

```{python}
# Import packages
import numpy as np
```

\AddToHookNext{env/Highlighting/begin}{\tiny}
```{python}
#| echo: true
w = np.array([0.7, 0.3])
Sigma = np.array([[0.09, 0.1], [0.1, 0.25]])

var_rp = w.T @ Sigma @ w
print("Variance of our example portfolio {:.4f}".format(var_rp))
print("Standard Deviation of our example portfolio {:.2f}".format(np.sqrt(var_rp)))
```

---

(in case you want to change the font size of all chunks, use \AddToHook{env/Highlighting/begin}{\tiny} in your header includes)