So I just deployed my movie recommendation on Shinyapps, but there's still one thing I want to change. Please see the pictures below. 
Since I didn't want to put "You might also like this" in another box, I don't really know how to adjust it in html/css format. To me, it's too close to the sidebar, I just want to make some spaces between it and the sidebar.
My code:
ui <- shinyUI(dashboardPage(skin="blue",
                            dashboardHeader(title = "Movies"),
                            dashboardSidebar(
                              sidebarMenu( 
                                menuItem(
                                  list( 
                                    selectInput("select", label = h5("Select 1 movie you like"),
                                                choices = as.character(movies$title[1:length(unique(movies$movieId))]),
                                                selectize = TRUE,
                                                selected = "Toy Story (1995)"),
                                    submitButton("Done")
                                  )
                                )
                              )
                            ),
                            dashboardBody( 
                              includeCSS("data/custom.css"),
                              fluidRow(
                                box(
                                  width=3,
                                  height=400,
                                  status = "primary", 
                                  title = "introduction",
                                  textOutput("name1"),
                                  #br(),  
                                  imageOutput("myImage",height="300px")
                                  #valueBoxOutput("tableRatings1")
                                ),
                                box(
                                  width=8,
                                  height=400,
                                  status = "primary",
                                  title = "Plot",
                                  textOutput("des1"),
                                  br(),
                                  h4("Ratings"),
                                  br(),
                                  valueBoxOutput("tableRatings1")
                                 )
                               ),
                              fluidRow(
                                h4("You might also like this"),
                                box(
                                  width=2,
                                  height=220,
                                  status = "danger",
                                  imageOutput("myImage1",height="150px"),
                                  textOutput("myreco1")
                                  #textOutput("myrate1")
                                ),
                                box(
                                  width=2,
                                  height=220,
                                  status = "danger",
                                  imageOutput("myImage2",height="150px"),
                                  textOutput("myreco2")
                                  #textOutput("myrate2")
                                ),
                                box(
                                  width=2,
                                  height=220,
                                  status = "danger",
                                  imageOutput("myImage3",height="150px"),
                                  textOutput("myreco3")
                                  #textOutput("myrate3")
                                ),
                                box(
                                  width=2,
                                  height=220,
                                  status = "danger",
                                  imageOutput("myImage4",height="150px"),
                                  textOutput("myreco4")
                                  #textOutput("myrate4")
                                ),
                                box(
                                  width=2,
                                  height=220,
                                  status = "danger",
                                  imageOutput("myImage5",height="150px"),
                                  textOutput("myreco5")
                                  #textOutput("myrate5")
                                )
                              )
                            )
)
)   
By the way, my shinyapps is running very slow now, I am not sure why. It used to run faster. And this application just costs total 4 hours at the moment. If I use free plan, every application have 25 hours right?
 
    