diff --git a/src/x49gpng/ui.c b/src/x49gpng/ui.c
index e830be8..391ba9c 100644
--- a/src/x49gpng/ui.c
+++ b/src/x49gpng/ui.c
@@ -55,12 +55,12 @@
 #define KEYBOARD_PADDING ( TINY_TEXT_HEIGHT + 2 )
 #define KEYBOARD_WIDTH ( ui_keys[ NB_KEYS - 1 ].x + ui_keys[ NB_KEYS - 1 ].width )
 
-#define WINDOW_WIDTH ( ( 2 * KEYBOARD_PADDING ) + KEYBOARD_WIDTH )
+#define WINDOW_WIDTH ( KEYBOARD_WIDTH )
 
 #define LCD_PADDING ( ( WINDOW_WIDTH - LCD_WIDTH ) / 2 )
 
 static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
-    {.css_class = "button-menu",
+    {.css_class = "menu",
      .label = "F1",
      .letter = "A",
      .left = "Y=",
@@ -75,7 +75,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 5 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-menu",
+    {.css_class = "menu",
      .label = "F2",
      .letter = "B",
      .left = "WIN",
@@ -90,7 +90,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 5 ),
      .rowbit = ( 1 << 2 ),
      .eint = 2},
-    {.css_class = "button-menu",
+    {.css_class = "menu",
      .label = "F3",
      .letter = "C",
      .left = "GRAPH",
@@ -105,7 +105,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 5 ),
      .rowbit = ( 1 << 3 ),
      .eint = 3},
-    {.css_class = "button-menu",
+    {.css_class = "menu",
      .label = "F4",
      .letter = "D",
      .left = "2D/3D",
@@ -120,7 +120,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 5 ),
      .rowbit = ( 1 << 4 ),
      .eint = 4},
-    {.css_class = "button-menu",
+    {.css_class = "menu",
      .label = "F5",
      .letter = "E",
      .left = "TBLSET",
@@ -135,7 +135,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 5 ),
      .rowbit = ( 1 << 5 ),
      .eint = 5},
-    {.css_class = "button-menu",
+    {.css_class = "menu",
      .label = "F6",
      .letter = "F",
      .left = "TABLE",
@@ -151,7 +151,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 6 ),
      .eint = 6},
 
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "APPS",
      .letter = "G",
      .left = "FILES",
@@ -159,82 +159,82 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .below = NULL,
      .x = 0,
      .y = KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
+     .width = KB_WIDTH_5_KEYS,
      .height = KB_HEIGHT_SMALL_KEYS,
      .column = 5,
      .row = 7,
      .columnbit = ( 1 << 5 ),
      .rowbit = ( 1 << 7 ),
      .eint = 7},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "MODE",
      .letter = "H",
      .left = "CUSTOM",
      .right = "END",
      .below = NULL,
-     .x = KB_COLUMN_WIDTH_6_KEYS,
+     .x = KB_COLUMN_WIDTH_5_KEYS,
      .y = KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
+     .width = KB_WIDTH_5_KEYS,
      .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 5,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 5 ),
      .eint = 5},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "TOOL",
      .letter = "I",
      .left = "i",
      .right = "I",
      .below = NULL,
-     .x = 2 * KB_COLUMN_WIDTH_6_KEYS,
+     .x = 2 * KB_COLUMN_WIDTH_5_KEYS,
      .y = KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
+     .width = KB_WIDTH_5_KEYS,
      .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 6,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 6 ),
      .eint = 6},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "VAR",
      .letter = "J",
      .left = "UPDIR",
      .right = "COPY",
      .below = NULL,
-     .x = 0,
-     .y = 2 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
+     .x = 4 * KB_COLUMN_WIDTH_5_KEYS,
+     .y = KB_LINE_HEIGHT,
+     .width = KB_WIDTH_5_KEYS,
      .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 7,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 7 ),
      .eint = 7},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "STO⏵",
      .letter = "K",
      .left = "RCL",
      .right = "CUT",
      .below = NULL,
-     .x = KB_COLUMN_WIDTH_6_KEYS,
+     .x = 0,
      .y = 2 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
+     .width = KB_WIDTH_5_KEYS,
      .height = KB_HEIGHT_SMALL_KEYS,
      .column = 7,
      .row = 1,
      .columnbit = ( 1 << 7 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "NXT",
      .letter = "L",
      .left = "PREV",
      .right = "PASTE",
      .below = NULL,
-     .x = 2 * KB_COLUMN_WIDTH_6_KEYS,
+     .x = KB_COLUMN_WIDTH_5_KEYS,
      .y = 2 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
+     .width = KB_WIDTH_5_KEYS,
      .height = KB_HEIGHT_SMALL_KEYS,
      .column = 7,
      .row = 2,
@@ -242,68 +242,68 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 2 ),
      .eint = 2},
 
-    {.css_class = "button-arrow",
-     .label = "▲",
+    {.css_class = "arrow",
+     .label = "⬆",
      .letter = NULL,
      .left = NULL,
      .right = NULL,
      .below = NULL,
-     .x = 4 * KB_COLUMN_WIDTH_6_KEYS,
-     .y = 0.75 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
-     .height = KB_HEIGHT_BIG_KEYS,
+     .x = 3 * KB_COLUMN_WIDTH_5_KEYS,
+     .y = KB_LINE_HEIGHT,
+     .width = KB_WIDTH_5_KEYS,
+     .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 1,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-arrow",
-     .label = "◀",
+    {.css_class = "arrow",
+     .label = "⬅",
      .letter = NULL,
      .left = NULL,
      .right = NULL,
      .below = NULL,
-     .x = 3.25 * KB_COLUMN_WIDTH_6_KEYS,
-     .y = 1.25 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
-     .height = KB_HEIGHT_BIG_KEYS,
+     .x = 2 * KB_COLUMN_WIDTH_5_KEYS,
+     .y = 2 * KB_LINE_HEIGHT,
+     .width = KB_WIDTH_5_KEYS,
+     .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 2,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 2 ),
      .eint = 2},
-    {.css_class = "button-arrow",
-     .label = "▼",
+    {.css_class = "arrow",
+     .label = "⬇",
      .letter = NULL,
      .left = NULL,
      .right = NULL,
      .below = NULL,
-     .x = 4 * KB_COLUMN_WIDTH_6_KEYS,
-     .y = 1.75 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
-     .height = KB_HEIGHT_BIG_KEYS,
+     .x = 3 * KB_COLUMN_WIDTH_5_KEYS,
+     .y = 2 * KB_LINE_HEIGHT,
+     .width = KB_WIDTH_5_KEYS,
+     .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 3,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 3 ),
      .eint = 3},
-    {.css_class = "button-arrow",
-     .label = "▶",
+    {.css_class = "arrow",
+     .label = "⮕",
      .letter = NULL,
      .left = NULL,
      .right = NULL,
      .below = NULL,
-     .x = 4.78 * KB_COLUMN_WIDTH_6_KEYS,
-     .y = 1.25 * KB_LINE_HEIGHT,
-     .width = KB_WIDTH_6_KEYS,
-     .height = KB_HEIGHT_BIG_KEYS,
+     .x = 4 * KB_COLUMN_WIDTH_5_KEYS,
+     .y = 2 * KB_LINE_HEIGHT,
+     .width = KB_WIDTH_5_KEYS,
+     .height = KB_HEIGHT_SMALL_KEYS,
      .column = 6,
      .row = 4,
      .columnbit = ( 1 << 6 ),
      .rowbit = ( 1 << 4 ),
      .eint = 4},
 
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "HIST",
      .letter = "M",
      .left = "CMD",
@@ -318,7 +318,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 4 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "EVAL",
      .letter = "N",
      .left = "PRG",
@@ -333,7 +333,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "'",
      .letter = "O",
      .left = "MTRW",
@@ -348,7 +348,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "SYMB",
      .letter = "P",
      .left = "MTH",
@@ -363,7 +363,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 1 ),
      .eint = 1},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "⬅",
      .letter = NULL,
      .left = "DEL",
@@ -379,7 +379,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 1 ),
      .eint = 1},
 
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "Y<sup>x</sup>",
      .letter = "Q",
      .left = "𝑒<sup>x</sup>",
@@ -394,11 +394,11 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 4 ),
      .rowbit = ( 1 << 2 ),
      .eint = 2},
-    {.css_class = "button-function",
-     .label = "√𝔁",
+    {.css_class = "function",
+     .label = "√𝓍",
      .letter = "R",
-     .left = "𝔁<sup>2</sup>",
-     .right = "<sup>x</sup>√y",
+     .left = "𝓍<sup>2</sup>",
+     .right = "<sup>x</sup>√𝓎",
      .below = NULL,
      .x = KB_COLUMN_WIDTH_5_KEYS,
      .y = 4 * KB_LINE_HEIGHT,
@@ -409,7 +409,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 2 ),
      .eint = 2},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "SIN",
      .letter = "S",
      .left = "ASIN",
@@ -424,7 +424,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 2 ),
      .eint = 2},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "COS",
      .letter = "T",
      .left = "ACOS",
@@ -439,7 +439,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 2 ),
      .eint = 2},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "TAN",
      .letter = "U",
      .left = "ATAN",
@@ -455,10 +455,10 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 2 ),
      .eint = 2},
 
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "EEX",
      .letter = "V",
-     .left = "10<sup>𝔁</sup>",
+     .left = "10<sup>𝓍</sup>",
      .right = "LOG",
      .below = NULL,
      .x = 0,
@@ -470,7 +470,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 4 ),
      .rowbit = ( 1 << 3 ),
      .eint = 3},
-    {.css_class = "button-function",
+    {.css_class = "function",
      .label = "+/-",
      .letter = "W",
      .left = "≠",
@@ -485,8 +485,8 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 3 ),
      .eint = 3},
-    {.css_class = "button-function",
-     .label = "𝔁",
+    {.css_class = "function",
+     .label = "𝓍",
      .letter = "X",
      .left = "≤",
      .right = "&gt;",
@@ -500,8 +500,8 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 3 ),
      .eint = 3},
-    {.css_class = "button-function",
-     .label = "1/𝔁",
+    {.css_class = "function",
+     .label = "1/𝓍",
      .letter = "Y",
      .left = "≥",
      .right = ">",
@@ -515,7 +515,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 3 ),
      .eint = 3},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "÷",
      .letter = "Z",
      .left = "ABS",
@@ -531,7 +531,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 3 ),
      .eint = 3},
 
-    {.css_class = "button-alpha",
+    {.css_class = "alpha",
      .label = "ALPHA",
      .letter = NULL,
      .left = "USER",
@@ -546,7 +546,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = 0,
      .rowbit = 0,
      .eint = 4},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "7",
      .letter = NULL,
      .left = "S.SLV",
@@ -561,7 +561,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 4 ),
      .eint = 4},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "8",
      .letter = NULL,
      .left = "EXP&amp;LN",
@@ -576,7 +576,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 4 ),
      .eint = 4},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "9",
      .letter = NULL,
      .left = "FINANCE",
@@ -591,7 +591,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 4 ),
      .eint = 4},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "×",
      .letter = NULL,
      .left = "[ ]",
@@ -607,7 +607,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 4 ),
      .eint = 4},
 
-    {.css_class = "button-shift-left",
+    {.css_class = "shift-left",
      .label = "⮢",
      .letter = NULL,
      .left = NULL,
@@ -622,7 +622,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = 0,
      .rowbit = 0,
      .eint = 5},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "4",
      .letter = NULL,
      .left = "CALC",
@@ -637,7 +637,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 5 ),
      .eint = 5},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "5",
      .letter = NULL,
      .left = "MATRICES",
@@ -652,7 +652,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 5 ),
      .eint = 5},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "6",
      .letter = NULL,
      .left = "CONVERT",
@@ -667,7 +667,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 5 ),
      .eint = 5},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "-",
      .letter = NULL,
      .left = "( )",
@@ -683,7 +683,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 5 ),
      .eint = 5},
 
-    {.css_class = "button-shift-right",
+    {.css_class = "shift-right",
      .label = "⮣",
      .letter = NULL,
      .left = NULL,
@@ -698,7 +698,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = 0,
      .rowbit = 0,
      .eint = 6},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "1",
      .letter = NULL,
      .left = "ARITH",
@@ -713,7 +713,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 6 ),
      .eint = 6},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "2",
      .letter = NULL,
      .left = "DEF",
@@ -728,7 +728,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 6 ),
      .eint = 6},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "3",
      .letter = NULL,
      .left = "#",
@@ -743,7 +743,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 6 ),
      .eint = 6},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "+",
      .letter = NULL,
      .left = "{ }",
@@ -759,7 +759,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .rowbit = ( 1 << 6 ),
      .eint = 6},
 
-    {.css_class = "button-core",
+    {.css_class = "core",
      .label = "ON",
      .letter = NULL,
      .left = "CONT",
@@ -774,7 +774,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = 0,
      .rowbit = 0,
      .eint = 0},
-    {.css_class = "button-core-number",
+    {.css_class = "core-number",
      .label = "0",
      .letter = NULL,
      .left = "∞",
@@ -789,7 +789,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 3 ),
      .rowbit = ( 1 << 7 ),
      .eint = 7},
-    {.css_class = "button-core",
+    {.css_class = "core",
      .label = ".",
      .letter = NULL,
      .left = ": :",
@@ -804,7 +804,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 2 ),
      .rowbit = ( 1 << 7 ),
      .eint = 7},
-    {.css_class = "button-core",
+    {.css_class = "core",
      .label = "SPC",
      .letter = NULL,
      .left = "𝚷",
@@ -819,7 +819,7 @@ static x49gp_ui_key_t ui_keys[ NB_KEYS ] = {
      .columnbit = ( 1 << 1 ),
      .rowbit = ( 1 << 7 ),
      .eint = 7},
-    {.css_class = "button-core",
+    {.css_class = "core",
      .label = "ENTER",
      .letter = NULL,
      .left = "ANS",
@@ -853,35 +853,35 @@ char* css_global = "window {"
                    "  background-image: none;"
                    "  padding: 0px;"
                    "}"
-                   ".button-menu {"
+                   "button.menu {"
                    "  background-color: #a9a9a9;"
                    "}"
-                   ".button-function {"
+                   "button.function {"
                    "  background-color: #696969;"
                    "}"
-                   ".button-arrow {"
+                   "button.arrow {"
                    "  background-color: #e0e0e0;"
                    "}"
-                   ".button-alpha {"
+                   "button.alpha {"
                    "  background-color: #fae82c;"
                    "}"
-                   ".button-core, .button-core-number {"
+                   "button.core, button.core-number {"
                    "  background-color: #080808;"
                    "}"
-                   ".button-alpha .label-key {"
+                   "button.alpha .label-key, button.arrow .label-key, button.menu .label-key {"
                    "  color: #080808;"
                    "}"
-                   ".button-shift-left {"
+                   "button.shift-left {"
                    "  background-color: %s;"
                    "}"
-                   ".button-shift-right {"
+                   "button.shift-right {"
                    "  background-color: #8e2518;"
                    "}"
-                   ".button-shift-left .label-key, .button-shift-right .label-key, .button-arrow .label-key {"
+                   "button.shift-left .label-key, button.shift-right .label-key {"
                    "  font-size: %ipx;"
                    "  color: #080808;"
                    "}"
-                   ".button-core-number .label-key {"
+                   "button.core-number .label-key, button.arrow .label-key {"
                    "  font-size: %ipx;"
                    "}"
                    ".label-key {"