ggplot: remove white outline from text

I'm trying to make a plot in Shiny and I want it to be with transparent background. However, when I remove the background there is appears a white outline around all text (title and axis labels in the reprex). How can I get rid of it?

P.S. When I just make a plot (not in Shiny app) and set plot.background = element_rect(fill = "red") where is no such outline (in the RStudio plot tab).



# Define UI for application that draws a histogram
ui <- shinydashboardPlus::dashboardPage(

    # Application title
    header = shinydashboardPlus::dashboardHeader(title = "Old Faithful Geyser Data"),

    # Sidebar with a slider input for number of bins 
    sidebar = shinydashboardPlus::dashboardSidebar(),
    body = shinydashboard::dashboardBody(
                title = "Plot",
                background = "red",
                plotOutput(outputId = "pubs_pl")


# Define server logic required to draw a histogram
server <- function(input, output) {

    output$pubs_pl <- renderPlot({
        ggplot(data = data.frame(x = rnorm(10),
                                          y = rnorm(10)),
                        ggplot2::aes(x = x, y = y))+
            labs(title = "Title")+
            theme(axis.text.x = element_text(size = 15))}, bg="transparent")


# Run the application 
shinyApp(ui = ui, server = server)

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