You can use this module with the following in your ~/.xmonad/xmonad.hs:

 import XMonad.Layout.DwmStyle

Then edit your layoutHook by adding the DwmStyle decoration to your layout:

 myL = dwmStyle shrinkText defaultTheme (layoutHook defaultConfig)
 main = xmonad defaultConfig { layoutHook = myL }

For more detailed instructions on editing the layoutHook see:

XMonad.Doc.Extending#Editing_the_layout_hook

You can also edit the default configuration options.

 myDWConfig = defaultTheme { inactiveBorderColor = "red"
                           , inactiveTextColor   = "red"}

and

 myL = dwmStyle shrinkText myDWConfig (layoutHook defaultConfig)

A complete xmonad.hs file for this would therefore be:

 import XMonad
 import XMonad.Layout.DwmStyle

 main = xmonad defaultConfig {
                    layoutHook =
                        dwmStyle shrinkText defaultTheme
                            (layoutHook defaultConfig)
              }