One line border and no color outside of border

Hi I have tried button and all I can say is great job!

I am noob but I have tried to make it with one line border and I managed to do that with modifying box.bat:
Line 54 - REM Set "Type=%~8" (not to forget)
Line 55 - Set "Type=1" (added and defined as 1 per instructions from comments in box.bat)

Is it possible to make it to color and hover  color to be inside border?

Thank you.