remove guibg for some highlight groups

lua/base16.lua

@@ -100,7 +100,7 @@ local function apply_base16_theme(theme, use_256_colorspace)
 	-- nvim.command "syntax reset"
 
 	-- Vim editor colors
-	highlight("Normal",        theme.base05, NONE, cterm05, NONE, nil, nil)
+	highlight("Normal",        theme.base05, "NONE", cterm05, "NONE", nil, nil)
 	highlight("Bold",          nil, nil, nil, nil, "bold", nil)
 	highlight("Debug",         theme.base08, nil, cterm08, nil, nil, nil)
 	highlight("Directory",     theme.base0D, nil, cterm0D, nil, nil, nil)
@@ -129,15 +129,15 @@ local function apply_base16_theme(theme, use_256_colorspace)
 	highlight("Conceal",       theme.base0D, theme.base00, cterm0D, cterm00, nil, nil)
 	highlight("Cursor",        theme.base00, theme.base05, cterm00, cterm05, nil, nil)
 	highlight("NonText",       theme.base03, nil, cterm03, nil, nil, nil)
-	highlight("LineNr",        theme.base03, theme.base01, cterm03, cterm01, nil, nil)
-	highlight("SignColumn",    theme.base03, theme.base01, cterm03, cterm01, nil, nil)
+	highlight("LineNr",        theme.base03, "NONE", cterm03, "NONE", nil, nil)
+	highlight("SignColumn",    theme.base03, "NONE", cterm03, "NONE", nil, nil)
 	highlight("StatusLine",    theme.base04, theme.base02, cterm04, cterm02, "none", nil)
-	highlight("StatusLineNC",  theme.base03, theme.base01, cterm03, cterm01, "none", nil)
-	highlight("VertSplit",     theme.base02, theme.base02, cterm02, cterm02, "none", nil)
+	highlight("StatusLineNC",  theme.base03, "NONE", cterm03, "NONE", "none", nil)
+	highlight("VertSplit",     theme.base02, "NONE", cterm02, "NONE", "none", nil)
 	highlight("ColorColumn",   nil, theme.base01, nil, cterm01, "none", nil)
 	highlight("CursorColumn",  nil, theme.base01, nil, cterm01, "none", nil)
 	highlight("CursorLine",    nil, theme.base01, nil, cterm01, "none", nil)
-	highlight("CursorLineNr",  theme.base04, theme.base01, cterm04, cterm01, nil, nil)
+	highlight("CursorLineNr",  theme.base04, "NONE", cterm04, "NONE", nil, nil)
 	highlight("QuickFixLine",  nil, theme.base01, nil, cterm01, "none", nil)
 	highlight("PMenu",         theme.base05, theme.base01, cterm05, cterm01, "none", nil)
 	highlight("PMenuSel",      theme.base01, theme.base05, cterm01, cterm05, nil, nil)