Custom selectInput Label Margin margin-top

In this app, I have four selectInput widgets in a dashboardSidebar which works well but the labels are up against the widget above it. In Firefox, changing the label margin-top attribute to 6px seem to fix the problem on selectInput "Four" (picture below), but I can't figure out where in UI should I make the label change. Adding margin-top: 6 to div style doesn't work.
div(style = "height: 50px; font-size: 10px; margin-top: 6;"

Adding the following dashboardSidebar does not work.
tags$style(HTML(".selectize-input {margin-top: 6;}")),

Thanks for the help...

library(shiny)
library(shinydashboard)
LL <- list("1" = 1, "2" = 2)
header <- dashboardHeader()
sidebar <- dashboardSidebar(
    div(style = "height: 50px; font-size: 10px;",
        dateRangeInput(
            inputId = "dateRange",
            label = "Date Range:",
            start = Sys.Date() - 4,
            end = Sys.Date(),
            max = Sys.Date()
        )
    ),
    div(style = "height: 30px; font-size: 10px;",
        radioButtons(
            "service",
            "Services",
            c("AAA", "BBB"),
            selected = "AAA",
            inline = TRUE
        )
    ),
    div(style = "height: 50px; font-size: 10px;",
        uiOutput("one_")
    ),
    div(style = "height: 50px; font-size: 10px;",
        uiOutput("two_")        
    ),
    div(style = "height: 50px; font-size: 10px;",
        selectInput("three", label="Three", choices = LL, selected = 1)
    ),
    div(style = "height: 50px; font-size: 10px;",
        selectInput("four", label="Four", choices = LL, selected = 1)
    )
)
body <- dashboardBody()
ui <- dashboardPage(header, sidebar, body) 
server <- function(input, output){
    output$one_ <- renderUI ({
        selectInput("one", label="One", choices = LL, selected = 1)
    })
    output$two_ <- renderUI ({
        selectInput("two", label="Two", choices = LL, selected = 1)
    })
}
shinyApp(ui, server)