diff --git a/units/on_screen_keyboard.cpp b/units/on_screen_keyboard.cpp
index a668afc..1bd55b7 100644
--- a/units/on_screen_keyboard.cpp
+++ b/units/on_screen_keyboard.cpp
@@ -61,7 +61,8 @@ void OnScreenKeyboard::fillTexture()
     text->write(text->getCharacterSize(), text->getCharacterSize(), caption);
 
     // Dibuja el cuadro donde va el texto que se escribirá
-    SDL_SetRenderDrawColor(renderer, bgColor.r - 10, bgColor.g - 10, bgColor.b - 10, 255);
+    const color_t darkColor = darkenColor(bgColor, 10);
+    SDL_SetRenderDrawColor(renderer, darkColor.r, darkColor.g, darkColor.b, 255);
     const int x_rect = (text->getCharacterSize() * 2) + text->lenght(caption);
     const int y_rect = text->getCharacterSize();
     const int w_rect = width - text->getCharacterSize() - x_rect;
diff --git a/units/utils.cpp b/units/utils.cpp
index 0ec44e6..0650d7d 100644
--- a/units/utils.cpp
+++ b/units/utils.cpp
@@ -1,6 +1,8 @@
 #include "utils.h"
 #include <math.h>
 
+using namespace std;
+
 // Calcula el cuadrado de la distancia entre dos puntos
 double distanceSquared(int x1, int y1, int x2, int y2)
 {
@@ -576,7 +578,27 @@ void initOptions(options_t *options)
     options->screen.borderHeight = 0;
 
     options->notifications.posV = pos_top;
-	options->notifications.posH = pos_left;
-	options->notifications.sound = true;
-	options->notifications.color = {48, 48, 48};
+    options->notifications.posH = pos_left;
+    options->notifications.sound = true;
+    options->notifications.color = {48, 48, 48};
+}
+
+// Oscurece un color
+color_t darkenColor(color_t color, int amount)
+{
+    color_t newColor;
+    newColor.r = max(0, color.r - amount);
+    newColor.g = max(0, color.g - amount);
+    newColor.b = max(0, color.b - amount);
+    return newColor;
+}
+
+// Aclara un color
+color_t lightenColor(color_t color, int amount)
+{
+    color_t newColor;
+    newColor.r = min(255, color.r + amount);
+    newColor.g = min(255, color.g + amount);
+    newColor.b = min(255, color.b + amount);
+    return newColor;
 }
\ No newline at end of file
diff --git a/units/utils.h b/units/utils.h
index 3e80288..b776c86 100644
--- a/units/utils.h
+++ b/units/utils.h
@@ -201,4 +201,10 @@ bool colorAreEqual(color_t color1, color_t color2);
 // Inicializa la estructura de opciones
 void initOptions(options_t *options);
 
+// Oscurece un color
+color_t darkenColor(color_t color, int amount);
+
+// Aclara un color
+color_t lightenColor(color_t color, int amount);
+
 #endif
\ No newline at end of file