Background color is cut in shinydashboard body - css

Question

I have several boxes that will be filled with plots and tables after user input.
Since I have changed the layout to be column-based, the background color seem to be cut under the first box like this:
I am not sure why is this happening.
Here is a sample code to reproduce the layout:
library(shiny)
library(shinydashboard)
sidebar <- dashboardSidebar(
sidebarMenu(
busyIndicator(text="Loading..."),
tags$head(
tags$style(
HTML('
#uploadfile{height: 25px}
#rat{height: 25px; font-size: 10px}
#pnum{height: 25px; font-size: 10px}
#mytext{width: 50px}
.content-wrapper,
.right-side {
background-color: #EBE5D0;
}
li { cursor: pointer; cursor: hand; }
')
)
),
menuItem("Network", icon = icon("table"), tabName = "network", badgeColor = "green")
)
)
body <- dashboardBody(
tabItems(
tabItem(tabName = "network",
column( width = 2,
box(
title="INPUT FILES",solidHeader = TRUE, status="primary",
fileInput('file1',"file 1", multiple=F,accep=".Rdata"),
fileInput('file2',"file 2", multiple=F,accep=".Rdata"),
fileInput('file3',"file 3", multiple=F,accep=".Rdata"),
fileInput('file4',"file 4", multiple=F,accep=".Rdata"),
uiOutput("phenoselect"),
uiOutput("phenolog"),
tags$div(align = 'left',
class = 'multicol', uiOutput("covarselect")),
uiOutput("snpPlotButton"),
height = 800,
width = NULL
)
),
column(width = 8,
box(
title="PLOT",solidHeader = TRUE, status="primary",
plotOutput('plotSNPmaf',height="500px"),
height = 800,
width = NULL
),
box(
title="TABLE",solidHeader = TRUE, status="primary",
dataTableOutput("seqMetaGene"),
uiOutput("BoxPlotButton"),
width = NULL
),
box(
title="BOXPLOT",solidHeader = TRUE, status="primary",
plotOutput("boxplotSnps"),
width = NULL
)
)
)
))
ui<- dashboardPage(
dashboardHeader(title = "Results"),
sidebar,
body
)
server <- function(input, output,session) {}
shinyApp(ui = ui, server = server)

Answer 1

You need to wrap your columns in a fluidRow, this way it will work.
Like this:
fluidRow(column( ... ),
column( ... ))
Screenshot of the working example:

Answer 2

Using this code you can set the background color. You just have to find the color that matches.
dashboardBody(
tags$head(tags$style(HTML('
.skin-blue .left-side, .skin-blue .wrapper {
background-color: #ecf0f5;
}
')))