### Bug description

The theme toggle icon isn't centred, it would be good to make it centred so it stays in line with the other icons. For reference, here's what the icon looks like:

<img width="245" alt="Screenshot 2022-07-16 at 10 21 39" src="https://user-images.githubusercontent.com/3131401/179347562-c45cdb7e-9d4b-4344-82ab-2af3bd0d20b8.png">

Here's the proposed change:

<img width="161" alt="Screenshot 2022-07-16 at 10 24 25" src="https://user-images.githubusercontent.com/3131401/179347573-82610d76-9bed-46f4-9926-9077d24d021b.png">

Here's a reproducible `_quatro.yml`:

```yaml
book:
  title: "Test"
  navbar:
    background: primary
    search: true
```



### `quarto check` Output

```
[✓] Checking Quarto installation......OK
      Version: 1.0.27
      Path: /Applications/quarto/bin

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.9.7 (Conda)
      Path: /Users/fabiorosado/miniconda3/bin/python
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with conda install jupyter

[✓] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/
```

### `quarto tools check` Output

```
[✓] Inspecting tools

Tool                Status               Installed     Latest
chromium     Not installed        ---           869685
tinytex          Not installed         ---           v2022.07
```

### Checklist

- [X] [formatted your issue](https://yihui.org/issue/#please-format-your-issue-correctly) so it is easier for us to read?
- [X] included a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] documented the quarto version you're running, by pasting the output from running `quarto check` in the "Quarto Check Output" text area?
- [X] documented the version of the quarto tools you're running, by providing the output from running `quarto tools check` in the "Quarto Tools Check Output" text area?
- [ ] documented the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] documented which operating system you're running? If on Linux, please provide the specific distribution as well.
- [X] upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?
dragonstyle
2022-07-16T08:45:10Z
FabioRosado
bug
Future
closed
Theme toggle isn't centred in navbar
https://github.com/quarto-dev/quarto-cli/issues/1422