Modify the text color of the sliderInput element within a Shiny application

I am attempting to change the font color of the values (1,2,3,...10) in the sliderInput() from black to white, but I am encountering difficulties. How can I connect the slider with the CSS file to achieve this?

 ui <- fluidPage(
  tags$style(type = "text/css", "
      .irs-grid-text {font-family: 'arial'; color: white; bottom: 17px; z-index: 1;}
    "),
  sliderInput(inputId="test", label=NULL, min=1, max=10, value=5, step = 1, width='100%')
)

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

shinyApp(ui = ui, server=server)

https://i.sstatic.net/WdajN.png

cssrshiny

Answer №1

To make it work, you can include !important in your CSS code, although it's not the most ideal solution - consider using an external stylesheet instead.

library(shiny)

ui <- fluidPage(
  tags$head(
  tags$style(HTML(type = "text/css", "
      .irs-grid-text {font-family: 'arial'; color: white !important; bottom: 17px; z-index: 1; }
    "))),
  sliderInput(inputId="test", label=NULL, min=1, max=10, value=5, step = 1, width='100%')
)

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

shinyApp(ui = ui, server=server)

Answer №2

To customize your slider, simply add .js-irs-0 to your CSS code and specify the desired styles. In this example, the color red is used for illustration purposes.

color = "orange"
ui <- fluidPage(
  tags$style(type = "text/css", "
     .js-irs-0 .irs-grid-text {font-family: 'arial'; color: red; bottom: 1px; z-index: 1;}
    "),
  setSliderColor(color,c(1)),
  sliderInput(inputId="test", label=NULL, min=1, max=10, value=5, step = 1, width='100%')
)

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

shinyApp(ui = ui, server=server)

https://i.sstatic.net/jLeOm.png

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