How to Customize Tab Background and Text Colors in Shiny tabPanel?

Background Customization of Tabs in Shiny tabPanel

Problem:

In a Shiny application, you wish to modify the background colors and text colors of the tabs in a tabPanel, specifically:

• When a tab is selected, its background should turn black with white text.
• Unselected tabs should display a white background with black text.

Solution:

To achieve this, you can utilize CSS styles as follows:

ui <- shinyUI(fluidPage(
  tags$style(".nav-tabs {
  background-color: aqua;  color:black}
.tabbable > .nav > li > a {
background-color: #006747;
color: white;
}
.nav-tabs-custom .nav-tabs li.active:hover a, .nav-tabs-custom .nav-tabs li.active a {
background-color: transparent;
border-color: transparent;
}
.nav-tabs-custom .nav-tabs li.active {
    border-top-color: #FFF;
}"),
    tabsetPanel(
      tabPanel(
        title = "Hello",
        textInput(inputId = "text", label = "Input")
      ),
      tabPanel(
        title = "World"
      )
    )
  )
)

Explanation:

This CSS code is implemented as follows:

• The .nav-tabs class sets the background of all tabs to aqua and black text.
• The .tabbable > .nav > li > a class modifies the background and text color of all tabs to black and white, respectively.
• The .nav-tabs-custom .nav-tabs li.active:hover a and .nav-tabs-custom .nav-tabs li.active a classes ensure that the background of the active tab remains transparent while hovering or clicking.
• The .nav-tabs-custom .nav-tabs li.active class sets the border-top color of the active tab to white.

This comprehensive solution allows you to customize the appearance of tabs in a shiny tabPanel to meet your specific requirements.

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