2.9 Layouts

Consider Using:
1. Bootstrap,
2. Page(s) with sidebar(s) & mainPanel(s)
3. CSS Grid (12 columns)
4. Tabsets
5. Themes

Example of Sidepanel and Mainpanel

fluidPage(
  titlePanel("Hello Shiny!"),
  sidebarLayout(
    sidebarPanel(    ## sidebar
      sliderInput("obs", 
                  "Observations:", 
                  min = 0, 
                  max = 1000, 
                  value = 500)
    ),
    mainPanel(      ## mainPanel
      plotOutput("distPlot")
    )
  )
)