bootswatch | Themes for Bootstrap | Theme library

There are several ways, but the easiest might be to use developer tools. You can do this in RStudio or your browser. After knitting, right-click and select "Inspect Element," "Inspect," or something along those lines (different browsers use slightly different names).

Either your screen will shift to fit this new view, or you'll see a new window open.

In RStudio, the top left of the window has a box/arrow symbol. Click it on (it turns green for me).

That icon looks like this:

Then move your cursor to the viewer pane, to the element in your RMD output that you want to know more about. Select the element by clicking on it two times (not double-click, more like 'select' and 'ya, I'm sure...').

Return to the inspector window. You're going to see something is highlighted. That's the HTML element for the element in your RMD output.

The style pane's content (on the right) has the styling—AKA CSS.

Next to the "Styles" header over the styles pane is "Computed." If you select "Computed," you'll get a summary of the applied styles.

My example RMD title is black:

This could look different depending on your browser and your OS, but the functionality is similar. If you have any questions, let me know.

From your comments, here are more specifics.

I started with the default RMD for bslib templates but replaced the YAML with the one provided in your question. I added some additional TOC elements and deleted a bit of the template. This is what I started with (hovering on one of the TOC elements to show the contrast).

Then I went to the inspector and selected the TOC two times. Then I returned to the inspector window to see what element was highlighted.

Next, I went to the Computed tab, and scrolled to the element background-color.

This told me what to look for and where to look. I could go to the inspector pane 'Source', but since you provided the link to the code in Github, I went there. I searched for "list-group." This is what I found there:

I can go back to the RMD and update my YAML now, like this:

You're importing Bootstrap once and the other SCSS are not doing anything.

Create a new file in your src root (I like to create a new folder called 'styles' to keep it all neat, so put the other scss files there as well):

src/styles/styles.scss

In this new file, add imports in same order:

Change your numericInputIcon to below piece.

This was a bug and has been fixed in the most recent version (#1.0.2). If you encounter this bug, please run:

I did a modification of the prettyRadioButtons function. But this is only specific to your case (3 / 3-3).

Perhaps you are looking for this

As mentioned in the comment, you can use the DT library. Here is a complete example.

Use dataTableOutput in your ui for your data table.

In server, you can include renderDataTable and customize here. In this case, selection is set for single cells.

You can capture the selection event (or can capture clicked event) with input$my_table_cells_selected. In my version I used an underscore for my_table. This information will include the row and column values of the cell selected.

Note that the DT data table could be editable and allow for other interactivity, depending on your needs.

Your above code uses updateNumericInput instead of updateNumericInputIcon. Also make sure to provide named parameters if you don't pass them in the expected order:

The issue here is that is not a child of :