diff --git a/DESCRIPTION b/DESCRIPTION
index a7d9edd..020a6f4 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -27,8 +27,7 @@ Imports:
     tibble,
     aplot,
     forcats,
-    tidyr,
-    shiny
+    tidyr
 URL: https://github.com/gaospecial/ggVennDiagram, https://gaospecial.github.io/ggVennDiagram/
 License: GPL-3
 Encoding: UTF-8
@@ -40,6 +39,7 @@ Suggests:
     knitr,
     rmarkdown,
     venn,
-    RColorBrewer
+    RColorBrewer,
+    shiny
 VignetteBuilder: knitr
 LazyData: true
diff --git a/R/check_pakage.R b/R/check_pakage.R
new file mode 100644
index 0000000..d87c5d6
--- /dev/null
+++ b/R/check_pakage.R
@@ -0,0 +1,8 @@
+check_package = function(package = "ggVennDiagram"){
+  if (!requireNamespace(package, quietly = TRUE)){
+    stop(paste("The", package, "package is not found in your library paths.",
+               "  It is required to show intersections interactively.",
+               "  Please run `install.packages('package')` and retry.",
+               collapse = "\n"))
+  }
+}
diff --git a/R/ggVennDiagram.R b/R/ggVennDiagram.R
index 3a7a8fc..ce0e1aa 100644
--- a/R/ggVennDiagram.R
+++ b/R/ggVennDiagram.R
@@ -151,7 +151,7 @@ plot_venn = function(data,
 
   # use plotly to show intersect
   if (show_intersect){
-    check_plotly()
+    check_package("plotly")
     region_label = region_label |>
       dplyr::rowwise() |>
       dplyr::mutate(item = str_wrap(paste0(.data$item, collapse = " "),
@@ -202,17 +202,6 @@ plot_venn = function(data,
 
 }
 
-
-check_plotly = function(){
-  if (!requireNamespace("plotly", quietly = TRUE)){
-    stop(paste("The plotly package is not found in your library paths.",
-               "  It is required to show intersections interactively.",
-               "  Please run `install.packages('plotly')` and retry.",
-               collapse = "\n"))
-  }
-}
-
-
 # from yulab.utils::str_wrap
 str_wrap = function (string, width = getOption("width")){
   result <- vapply(string, FUN = function(st) {
diff --git a/R/launch_app.R b/R/launch_app.R
index 9576ba2..b1a7cbe 100644
--- a/R/launch_app.R
+++ b/R/launch_app.R
@@ -3,11 +3,12 @@
 #' @return a shiny app
 #' @export
 launch_app = function(){
+  check_package("shiny")
   app = system.file(
     "shiny",
     "shinyApp.R",
     package = "ggVennDiagram",
     mustWork = TRUE
   )
-  shiny::runApp(app)
+  if(interactive()) shiny::runApp(app)
 }
diff --git a/inst/shiny/shinyApp.R b/inst/shiny/shinyApp.R
index ec9c0bf..0947ec2 100644
--- a/inst/shiny/shinyApp.R
+++ b/inst/shiny/shinyApp.R
@@ -26,7 +26,8 @@ ui = fluidPage(
       actionButton(
         inputId = "increase_btn",
         label = "increase the no. of set",
-        icon = icon("caret-up")
+        icon = icon("caret-up"),
+        align = "right"
       ),
 
       hr(),
@@ -90,11 +91,11 @@ server = function(input, output, session){
   # initialize plot note
   output$plot_note = renderUI({
     tagList(
-      h3("Steps"),
-      p("1. Use the button or slider to set the no. of sets."),
-      p("2. Specify set members using comma-sparated strings."),
-      p("3. Click the <Plot Now!> button."),
-      p("4. Enjoy and download your publication-quality figures.")
+      markdown("### Steps"),
+      markdown("1. Use the button or slider to specify the number of sets."),
+      markdown("2. Specify set members using comma-sparated strings (just follow the examples)."),
+      markdown("3. Click the **<Plot Now!>** button."),
+      markdown("4. Enjoy and download your publication-quality figures.")
     )
   })