diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6b42be..aa92e67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,8 +6,20 @@ and this project adheres to the versioning of Factorio, so 0.18.x will be at lea
 
 ## [Released]
 
+## [0.18.3] - 2020-06-07
+### General
+A small visual overhaul of the mod
+### Added
+- Added the possibility to "calculate further" (especially usefull when setting "Clear equation on calculation" is set). When the equation doesn't start with a number, character or parenthesis (so it assumes it starts with a math symbol) it will take the previous result and prepend it to the current equation.
+
+### Changed
+- Updated the UI a bit to match it in color a bit more to the Windows calculator
+- Updated also the icon on the shortcut to better distinguish it
+
 ## [0.18.2] - 2020-06-06
+### General
 Based on user feedback updated the mod
+
 ### Added
 - new easter egg :-)
 - added more math.lib functions
@@ -26,7 +38,9 @@ Based on user feedback updated the mod
 - Fixed sqrt(-1) equaling "na" because of the rounding fix from 0.18.1. It does now show "NaN" again
 
 ## [0.18.1] - 2020-06-06
+### General
 Based on user feedback updated the mod
+
 ### Added
 - Shortcut for opening the calculator and automatically focus on the input (Default: Ctrl+Shift+C) 
 
diff --git a/calcui-styles.lua b/calcui-styles.lua
index 9111c3c..970889e 100644
--- a/calcui-styles.lua
+++ b/calcui-styles.lua
@@ -2,21 +2,9 @@
 
 local default_gui = data.raw["gui-style"].default
 
-default_gui.calcui_sprite_obj_style = {
-	type = "button_style",
-	-- parent="button_style",
-	top_padding = 0,
-	right_padding = 0,
-	bottom_padding = 0,
-	left_padding = 0,
-	height = 32,
-	width = 32,
-	scalable = false
-}
-
 default_gui.calcui_button_style = {
 	type = "button_style",
-	-- parent="button_style",
+	parent = "icon_button",
 	top_padding = 0,
 	right_padding = 0,
 	bottom_padding = 0,
@@ -25,33 +13,20 @@ default_gui.calcui_button_style = {
 	width = 50,
 	scalable = false
 }
-
-default_gui.calcui_textfield_style = {
-	type = "textbox_style",
-	width = 212
+default_gui.calcui_button_style_red = {
+	type = "button_style",
+	parent = "calcui_button_style",
+	sprite = "sprite_calcui_red"
 }
-
-default_gui.calcui_table_style = {
-	type = "table_style",
-	horizontal_spacing = 5,
-	vertical_spacing = 1,
-	resize_row_to_width = false,
-	resize_to_row_height = false,
+default_gui.calcui_button_style_light = {
+	type = "button_style",
+	parent = "calcui_button_style",
+	sprite = "sprite_calcui_light"
 }
-
-default_gui.calcui_scroll_pane_style = {
-	type = "scroll_pane_style",
-	-- parent="scroll_pane_style",
-	-- flow_style =
-	-- {
-	-- 	type = "flow_style",
-	-- 	parent = "flow_style"
-	-- },
-	resize_row_to_width = true,
-	resize_to_row_height = false,
-	minimal_height=128,
-	maximal_height=400,
-	max_on_row = 1,
+default_gui.calcui_button_style_dark = {
+	type = "button_style",
+	parent = "calcui_button_style",
+	sprite = "sprite_calcui_dark"
 }
 
 data:extend({
@@ -75,5 +50,26 @@ data:extend({
 		filename = "__calculator-ui__/graphics/calculator.png",
 		width = 64,
 		height = 64
+	},
+	{
+		type = "sprite",
+		name = "sprite_calcui_red",
+		filename = "__calculator-ui__/graphics/red.png",
+		width = 50,
+		height = 50
+	},
+	{
+		type = "sprite",
+		name = "sprite_calcui_light",
+		filename = "__calculator-ui__/graphics/light.png",
+		width = 50,
+		height = 50
+	},
+	{
+		type = "sprite",
+		name = "sprite_calcui_dark",
+		filename = "__calculator-ui__/graphics/dark.png",
+		width = 50,
+		height = 50
 	}
 })
\ No newline at end of file
diff --git a/calculator.lua b/calculator.lua
index 34448dc..1940ac1 100644
--- a/calculator.lua
+++ b/calculator.lua
@@ -95,41 +95,42 @@ function show_calculator(player)
 		
 		local display = col1.add({
 			type = "textfield", 
-			style = "calcui_textfield_style", 
 			caption = "", 
 			name = "calcui_display"
 		})
+		display.style.width = 212
 
 		local row1 = col1.add({type="flow", name="calcui_col1_row1", direction="horizontal"})
-		row1.add({type="button", style="calcui_button_style", caption="CE", name="calcui_button_CE"})		-- CE = Clear Entry (just this line)
-		row1.add({type="button", style="calcui_button_style", caption="C",  name="calcui_button_C"})		-- C  = Clear (all, past results as well)
-		row1.add({type="button", style="calcui_button_style", caption="BS", name="calcui_button_BS"})
-		row1.add({type="button", style="calcui_button_style", caption="/",  name="calcui_button_DIV"})
+		row1.add({type="sprite-button", style="calcui_button_style_light", caption="CE", name="calcui_button_CE"}).sprite = "sprite_calcui_light"		-- CE = Clear Entry (just this line)
+		row1.add({type="sprite-button", style="calcui_button_style_light", caption="C",  name="calcui_button_C"}).sprite = "sprite_calcui_light"		-- C  = Clear (all, past results as well)
+		row1.add({type="sprite-button", style="calcui_button_style_light", caption="BS", name="calcui_button_BS"}).sprite = "sprite_calcui_light"
+		row1.add({type="sprite-button", style="calcui_button_style_light", caption="/",  name="calcui_button_DIV"}).sprite = "sprite_calcui_light"
 
 		local row2 = col1.add({type="flow", name="calcui_col1_row2", direction="horizontal"})
-		row2.add({type="button", style="calcui_button_style", caption="7",  name="calcui_button_7"})
-		row2.add({type="button", style="calcui_button_style", caption="8",  name="calcui_button_8"})
-		row2.add({type="button", style="calcui_button_style", caption="9",  name="calcui_button_9"})
-		row2.add({type="button", style="calcui_button_style", caption="*",  name="calcui_button_MUL"})
+		row2.add({type="sprite-button", style="calcui_button_style_dark",  caption="7",  name="calcui_button_7"}).sprite = "sprite_calcui_dark"
+		row2.add({type="sprite-button", style="calcui_button_style_dark",  caption="8",  name="calcui_button_8"}).sprite = "sprite_calcui_dark"
+		row2.add({type="sprite-button", style="calcui_button_style_dark",  caption="9",  name="calcui_button_9"}).sprite = "sprite_calcui_dark"
+		row2.add({type="sprite-button", style="calcui_button_style_light", caption="*",  name="calcui_button_MUL"}).sprite = "sprite_calcui_light"
 
 		local row3 = col1.add({type="flow", name="calcui_col1_row3", direction="horizontal"})
-		row3.add({type="button", style="calcui_button_style", caption="4",  name="calcui_button_4"})
-		row3.add({type="button", style="calcui_button_style", caption="5",  name="calcui_button_5"})
-		row3.add({type="button", style="calcui_button_style", caption="6",  name="calcui_button_6"})
-		row3.add({type="button", style="calcui_button_style", caption="-",  name="calcui_button_SUB"})
+		row3.add({type="sprite-button", style="calcui_button_style_dark",  caption="4",  name="calcui_button_4"}).sprite = "sprite_calcui_dark"
+		row3.add({type="sprite-button", style="calcui_button_style_dark",  caption="5",  name="calcui_button_5"}).sprite = "sprite_calcui_dark"
+		row3.add({type="sprite-button", style="calcui_button_style_dark",  caption="6",  name="calcui_button_6"}).sprite = "sprite_calcui_dark"
+		row3.add({type="sprite-button", style="calcui_button_style_light", caption="-",  name="calcui_button_SUB"}).sprite = "sprite_calcui_light"
 
 		local row4 = col1.add({type="flow", name="calcui_col1_row4", direction="horizontal"})
-		row4.add({type="button", style="calcui_button_style", caption="1",  name="calcui_button_1"})
-		row4.add({type="button", style="calcui_button_style", caption="2",  name="calcui_button_2"})
-		row4.add({type="button", style="calcui_button_style", caption="3",  name="calcui_button_3"})
-		row4.add({type="button", style="calcui_button_style", caption="+",  name="calcui_button_ADD"})
+		row4.add({type="sprite-button", style="calcui_button_style_dark",  caption="1",  name="calcui_button_1"}).sprite = "sprite_calcui_dark"
+		row4.add({type="sprite-button", style="calcui_button_style_dark",  caption="2",  name="calcui_button_2"}).sprite = "sprite_calcui_dark"
+		row4.add({type="sprite-button", style="calcui_button_style_dark",  caption="3",  name="calcui_button_3"}).sprite = "sprite_calcui_dark"
+		row4.add({type="sprite-button", style="calcui_button_style_light", caption="+",  name="calcui_button_ADD"}).sprite = "sprite_calcui_light"
 
 		local row5 = col1.add({type="flow", name="calcui_col1_row5", direction="horizontal"})
-		row5.add({type="button", style="calcui_button_style", caption="%",  name="calcui_button_PERC"})
-		row5.add({type="button", style="calcui_button_style", caption="0",  name="calcui_button_0"})
-		row5.add({type="button", style="calcui_button_style", caption=".",  name="calcui_button_DOT"})
-		row5.add({type="button", style="calcui_button_style", caption="=",  name="calcui_button_EQU"})		
+		row5.add({type="sprite-button", style="calcui_button_style_light", caption="%",  name="calcui_button_PERC"}).sprite = "sprite_calcui_light"
+		row5.add({type="sprite-button", style="calcui_button_style_dark",  caption="0",  name="calcui_button_0"}).sprite = "sprite_calcui_dark"
+		row5.add({type="sprite-button", style="calcui_button_style_dark",  caption=".",  name="calcui_button_DOT"}).sprite = "sprite_calcui_dark"
+		row5.add({type="sprite-button", style="calcui_button_style_red",   caption="=",  name="calcui_button_EQU"}).sprite = "sprite_calcui_red"
 
+		--.sprite = "sprite_calcui_dark"
 
 		local col2 = table.add({
 			type = "flow", 
@@ -206,6 +207,7 @@ function process_ce_key(player, button)
 	local root = get_gui_root(player)
 	clear_equation(player)
 	root.calcui.calcui_table.calcui_table_col2.calcui_display_result.caption = "="
+	root.calcui.calcui_table.calcui_table_col2.calcui_display_result.tooltip = ""
 end
 
 -- ----------------------------------------------------------------
@@ -222,9 +224,23 @@ function process_backspace_key(player, button)
 end
 
 -- ----------------------------------------------------------------
-function fix_equation(equation)
+function fix_equation(equation, root)
 	local result = equation
-	
+	local prev_result = root.calcui.calcui_table.calcui_table_col2.calcui_display_result.tooltip
+
+
+	-- 1. visible part
+	-- if equation does not start with a number or char, use the previous result (if available) and put it in front
+	if not (string.match(result:sub(1, 1), "[^%w%(%)]") == nil) and prev_result then
+		result = prev_result .. result
+	end
+
+	-- remove "math."
+	result = result:gsub("math.", "")
+	local new_equation = result
+
+
+	-- 2. invisible part
 	-- fix math library shortcuts
 	local math_lib = {
 		["abs"]   = "math.abs",
@@ -267,16 +283,16 @@ function fix_equation(equation)
 	result = result:gsub(",", ".")
 	result = result:gsub(";", ",")
 
-	return result
+
+	return result, new_equation
 end
 
 -- ----------------------------------------------------------------
 function process_equal_key(player, button)
 	local root = get_gui_root(player)
-	
 	local original_equation = root.calcui.calcui_table.calcui_table_col1.calcui_display.text;
 	
-	equation = fix_equation(original_equation)
+	equation, original_equation = fix_equation(original_equation, root)
 	
 	-- just testing
 	--root.calcui.calcui_table.calcui_table_col1.calcui_display.text = equation
diff --git a/graphics/calculator.png b/graphics/calculator.png
index d95b768..81404df 100644
--- a/graphics/calculator.png
+++ b/graphics/calculator.png
diff --git a/graphics/dark.png b/graphics/dark.png
new file mode 100644
index 0000000..beaa0f2
--- /dev/null
+++ b/graphics/dark.png
diff --git a/graphics/light.png b/graphics/light.png
new file mode 100644
index 0000000..2cfefad
--- /dev/null
+++ b/graphics/light.png
diff --git a/graphics/red.png b/graphics/red.png
new file mode 100644
index 0000000..1de6ebb
--- /dev/null
+++ b/graphics/red.png
diff --git a/info.json b/info.json
index e6e7215..1672cd0 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
 	"name": "calculator-ui",
-	"version": "0.18.2",
+	"version": "0.18.3",
 	"title": "Calculator UI",
 	"author": "Wichu",
 	"factorio_version": "0.18",