如何根据selectInput()有条件地改变闪亮的wellPanel()背景颜色？

selectInput(inputId = "condition", label = "选择条件", choices = c("条件1", "条件2", "条件3"))

observeEvent(input$condition, {
  if (input$condition == "条件1") {
    shinyjs::addClass(selector = "div.well", class = "bg-color1")
  } else if (input$condition == "条件2") {
    shinyjs::addClass(selector = "div.well", class = "bg-color2")
  } else if (input$condition == "条件3") {
    shinyjs::addClass(selector = "div.well", class = "bg-color3")
  }
})

wellPanel(
  div(class = "well bg-color-default", "闪亮的面板内容")
)

.bg-color-default {
  background-color: #ffffff; /* 初始背景颜色 */
}

.bg-color1 {
  background-color: #ff0000; /* 条件1下的背景颜色 */
}

.bg-color2 {
  background-color: #00ff00; /* 条件2下的背景颜色 */
}

.bg-color3 {
  background-color: #0000ff; /* 条件3下的背景颜色 */
}