R shinydashboardplus flipbox -如何删除图像

install.packages("shinydashboardplus")

library(shiny)
library(shinydashboard)
library(shinydashboardPlus)

ui <- dashboardPage(
  dashboardHeader(),
  dashboardSidebar(),
  dashboardBody(
    flipBox(
      title = "Flip Box",
      front = img(src = "path_to_image.jpg"),  # 替换为要显示的图像路径
      back = "Back content"
    )
  )
)

server <- function(input, output) {
  
}

shinyApp(ui, server)

flipBox(
  title = "Flip Box",
  front = "",  # 删除图像
  back = "Back content"
)