R Shiny - Change direction color sliderInput

Question

I want to change the direction where the color in the sliderInput is by default. For example:

ui <- fluidPage(
  fluidRow(
    column(width = 6,
      sliderInput( inputId = "mySlider", 
                   label = "Some text",
                   min = 0, max = 50,
                   value = 10
      )
    )
  )
)

server <- function(input, output, session) {}
shinyApp(ui, server)

Instead of having the blue color filled from 0 to 10 (at initial values), filling from 10 to 50.

I saw that noUiSliderInput from the shinyWidgets package allows changing the direction, but it changes everything not just the color.

Is there an easy way to do this?

Answer 1

Thanks to starja answer, I finally found how to change (one or several sliders) with the exact same appearance as sliderInput. Here is the code:

library(shiny)

css <- "
#reverseSlider .irs-bar {
    border-top: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    background: linear-gradient(to bottom, #DDD -50%, #FFF 150%);
}
#reverseSlider .irs-bar-edge {
    border: 1px solid #ddd;
    background: linear-gradient(to bottom, #DDD -50%, #FFF 150%);
    border-right: 0;
}
#reverseSlider .irs-line {
    background: #428bca;
    border: 1px solid #428bca;
}
"

ui <- fluidPage(
  fluidRow(
    column(width = 6,
           tags$style(type='text/css', css),
           div(id = "reverseSlider", 
               sliderInput( inputId = "mySlider1", 
                            label = "Some text",
                            min = 0, max = 50,
                            value = 10 )
           ),
           sliderInput( inputId = "mySlider2", 
                        label = "Some other text",
                        min = 0, max = 50,
                        value = 10 )
    )
  )
)

server <- function(input, output, session) {}
shinyApp(ui, server)