I want to center two actions buttons of equal width with some space between them. So I tried:

```
library(shiny)

ui <- fluidPage(
  fluidRow(
    align = "center",
    br(),
    column(
      12,
      actionButton(
        inputId = "ab1",
        label = "Left button",
        style = "width:400px"
      ),
      actionButton(
        inputId = "ab2",
        label = "Right button",
        style = "width:400px"
      )
    ) # column 
  ) # fluidRow
) # fluidPage

server <- function(input, output) {}

shinyApp(ui, server)

```

This gives:

[![enter image description here](https://i.stack.imgur.com/As47N.png)](https://i.stack.imgur.com/As47N.png)

How to increase the space between the two buttons? Following [Shiny - How to increase spacing between inline radio buttons?](https://stackoverflow.com/questions/41993092/shiny-how-to-increase-spacing-between-inline-radio-buttons) I tried `style = "width:400px; margin.left:200px"` on the right button, but this did not have any effect.

**EDIT:** Following Stephane's proposal I tried:

```
library(shiny)

ui <- fluidPage(
  fluidRow(
    align = "center",
    br(),
    column(
      6,
      actionButton(
        inputId = "ab1",
        label = "Left button",
        style = "width:400px"
      )
    ),
    column(
      6,
      actionButton(
        inputId = "ab2",
        label = "Right button",
        style = "width:400px"
      )
    ) 
  ) # fluidRow
) # fluidPage

server <- function(input, output) {}

shinyApp(ui, server)

```

However, now the space between the two buttons is too big:

[![enter image description here](https://i.stack.imgur.com/b5jwD.png)](https://i.stack.imgur.com/b5jwD.png)

How to make it smaller, i. e., how to control it?