diff --git a/res/values/themes.xml b/res/values/themes.xml
index b23beda..671912e 100644
--- a/res/values/themes.xml
+++ b/res/values/themes.xml
@@ -14,8 +14,14 @@
     <attr name="secondaryLightOffset" format="float"/>
     <!-- Corner labels -->
     <attr name="colorSubLabel" format="color"/>
-    <!-- Dimens -->
+    <!-- Borders -->
     <attr name="keyBorderRadius" format="dimension"/>
+    <attr name="keyBorderWidth" format="dimension"/>
+    <attr name="keyBorderWidthActivated" format="dimension"/>
+    <attr name="keyBorderColorLeft" format="color"/>
+    <attr name="keyBorderColorTop" format="color"/>
+    <attr name="keyBorderColorRight" format="color"/>
+    <attr name="keyBorderColorBottom" format="color"/>
     <!-- Emoji panel -->
     <attr name="emoji_button_bg" type="color" format="color"/>
     <attr name="emoji_color" type="color" format="color"/>
@@ -30,6 +36,8 @@
     <item name="navigationBarColor">?attr/colorKeyboard</item>
     <item name="windowLightNavigationBar">?attr/android:isLightTheme</item>
     <item name="keyBorderRadius">5dp</item>
+    <item name="keyBorderWidth">0dp</item>
+    <item name="keyBorderWidthActivated">0dp</item>
     <item name="emoji_key_bg" type="color">?attr/emoji_button_bg</item>
     <item name="emoji_key_text" type="color">?attr/colorLabel</item>
   </style>
@@ -38,6 +46,9 @@
     <item name="colorKeyboard">#1b1b1b</item>
     <item name="colorKey">#333333</item>
     <item name="colorKeyActivated">#1b1b1b</item>
+    <item name="keyBorderWidth">1.2dp</item>
+    <item name="keyBorderWidthActivated">0dp</item>
+    <item name="keyBorderColorBottom">#404040</item>
     <item name="colorLabel">#ffffff</item>
     <item name="colorLabelActivated">#3399ff</item>
     <item name="colorLabelLocked">#33cc33</item>
@@ -51,6 +62,12 @@
     <item name="colorKeyboard">#e3e3e3</item>
     <item name="colorKey">#cccccc</item>
     <item name="colorKeyActivated">#e3e3e3</item>
+    <item name="keyBorderWidth">0.6dp</item>
+    <item name="keyBorderWidthActivated">0dp</item>
+    <item name="keyBorderColorLeft">#cccccc</item>
+    <item name="keyBorderColorTop">#eeeeee</item>
+    <item name="keyBorderColorRight">#cccccc</item>
+    <item name="keyBorderColorBottom">#aaaaaa</item>
     <item name="colorLabel">#000000</item>
     <item name="colorLabelActivated">#0066cc</item>
     <item name="colorLabelLocked">#33cc33</item>
@@ -64,6 +81,12 @@
     <item name="colorKeyboard">#000000</item>
     <item name="colorKey">#000000</item>
     <item name="colorKeyActivated">#333333</item>
+    <item name="keyBorderWidth">1dp</item>
+    <item name="keyBorderWidthActivated">1dp</item>
+    <item name="keyBorderColorLeft">#2a2a2a</item>
+    <item name="keyBorderColorTop">#2a2a2a</item>
+    <item name="keyBorderColorRight">#2a2a2a</item>
+    <item name="keyBorderColorBottom">#2a2a2a</item>
     <item name="colorLabel">#eeeeee</item>
     <item name="colorLabelActivated">#009dff</item>
     <item name="colorLabelLocked">#00ff26</item>
@@ -77,7 +100,13 @@
     <item name="android:isLightTheme">true</item>
     <item name="colorKeyboard">#ffffff</item>
     <item name="colorKey">#ffffff</item>
-    <item name="colorKeyActivated">#cccccc</item>
+    <item name="keyBorderWidth">1dp</item>
+    <item name="keyBorderWidthActivated">1dp</item>
+    <item name="keyBorderColorLeft">#f0f0f0</item>
+    <item name="keyBorderColorTop">#f0f0f0</item>
+    <item name="keyBorderColorRight">#eeeeee</item>
+    <item name="keyBorderColorBottom">#eeeeee</item>
+    <item name="colorKeyActivated">#ffffff</item>
     <item name="colorLabel">#000000</item>
     <item name="colorLabelActivated">#0066cc</item>
     <item name="colorLabelLocked">#33cc33</item>
diff --git a/srcs/juloo.keyboard2/Keyboard2View.java b/srcs/juloo.keyboard2/Keyboard2View.java
index 05cb765..631b363 100644
--- a/srcs/juloo.keyboard2/Keyboard2View.java
+++ b/srcs/juloo.keyboard2/Keyboard2View.java
@@ -3,6 +3,7 @@ package juloo.keyboard2;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Rect;
 import android.graphics.RectF;
@@ -265,9 +266,7 @@ public class Keyboard2View extends View
         x += k.shift * _keyWidth;
         float keyW = _keyWidth * k.width - _config.keyHorizontalInterval;
         boolean isKeyDown = _pointers.isKeyDown(k);
-        _tmpRect.set(x, y, x + keyW, y + keyH);
-        canvas.drawRoundRect(_tmpRect, _theme.keyBorderRadius, _theme.keyBorderRadius,
-            isKeyDown ? _theme.keyDownBgPaint : _theme.keyBgPaint);
+        drawKeyFrame(canvas, x, y, keyW, keyH, isKeyDown);
         drawLabel(canvas, k.key0, keyW / 2f + x, y, keyH, isKeyDown);
         if (k.edgekeys)
         {
@@ -299,6 +298,41 @@ public class Keyboard2View extends View
     super.onDetachedFromWindow();
   }
 
+  /** Draw borders and background of the key. */
+  void drawKeyFrame(Canvas canvas, float x, float y, float keyW, float keyH,
+      boolean isKeyDown)
+  {
+    float r = _theme.keyBorderRadius;
+    float w = isKeyDown ? _theme.keyBorderWidthActivated : _theme.keyBorderWidth;
+    float w2 = _theme.keyBorderWidth / 2.f;
+    _tmpRect.set(x + w2, y + w2, x + keyW - w2, y + keyH - w2);
+    canvas.drawRoundRect(_tmpRect, r, r,
+        isKeyDown ? _theme.keyDownBgPaint : _theme.keyBgPaint);
+    if (w > 0.f)
+    {
+      _theme.keyBorderPaint.setStrokeWidth(w);
+      float overlap = r - r * 0.85f + w; // sin(45°)
+      drawBorder(canvas, x, y, x + overlap, y + keyH, _theme.keyBorderColorLeft);
+      drawBorder(canvas, x, y, x + keyW, y + overlap, _theme.keyBorderColorTop);
+      drawBorder(canvas, x + keyW - overlap, y, x + keyW, y + keyH, _theme.keyBorderColorRight);
+      drawBorder(canvas, x, y + keyH - overlap, x + keyW, y + keyH, _theme.keyBorderColorBottom);
+    }
+  }
+
+  /** Clip to draw a border at a time. This allows to call [drawRoundRect]
+      several time with the same parameters but a different Paint. */
+  void drawBorder(Canvas canvas, float clipl, float clipt, float clipr,
+      float clipb, int color)
+  {
+    Paint p = _theme.keyBorderPaint;
+    float r = _theme.keyBorderRadius;
+    canvas.save();
+    canvas.clipRect(clipl, clipt, clipr, clipb);
+    p.setColor(color);
+    canvas.drawRoundRect(_tmpRect, r, r, p);
+    canvas.restore();
+  }
+
   private int labelColor(KeyValue k, boolean isKeyDown, boolean sublabel)
   {
     if (isKeyDown)
diff --git a/srcs/juloo.keyboard2/Theme.java b/srcs/juloo.keyboard2/Theme.java
index 21d21fd..b5e5b88 100644
--- a/srcs/juloo.keyboard2/Theme.java
+++ b/srcs/juloo.keyboard2/Theme.java
@@ -12,6 +12,7 @@ public class Theme
 {
   public final Paint keyBgPaint = new Paint();
   public final Paint keyDownBgPaint = new Paint();
+  public final Paint keyBorderPaint = new Paint();
   public final int lockedColor;
   public final int activatedColor;
   public final int labelColor;
@@ -19,6 +20,12 @@ public class Theme
   public final int secondaryLabelColor;
 
   public final float keyBorderRadius;
+  public final float keyBorderWidth;
+  public final float keyBorderWidthActivated;
+  public final int keyBorderColorLeft;
+  public final int keyBorderColorTop;
+  public final int keyBorderColorRight;
+  public final int keyBorderColorBottom;
 
   public final int colorNavBar;
   public final boolean isLightNavBar;
@@ -32,7 +39,8 @@ public class Theme
   public Theme(Context context, AttributeSet attrs)
   {
     TypedArray s = context.getTheme().obtainStyledAttributes(attrs, R.styleable.keyboard, 0, 0);
-    keyBgPaint.setColor(s.getColor(R.styleable.keyboard_colorKey, 0));
+    int colorKey = s.getColor(R.styleable.keyboard_colorKey, 0);
+    keyBgPaint.setColor(colorKey);
     keyDownBgPaint.setColor(s.getColor(R.styleable.keyboard_colorKeyActivated, 0));
     // colorKeyboard = s.getColor(R.styleable.keyboard_colorKeyboard, 0);
     colorNavBar = s.getColor(R.styleable.keyboard_navigationBarColor, 0);
@@ -44,6 +52,13 @@ public class Theme
     float secondaryLightOffset = s.getFloat(R.styleable.keyboard_secondaryLightOffset, 1.f);
     secondaryLabelColor = adjustLight(labelColor, secondaryLightOffset);
     keyBorderRadius = s.getDimension(R.styleable.keyboard_keyBorderRadius, 0);
+    keyBorderWidth = s.getDimension(R.styleable.keyboard_keyBorderWidth, 0);
+    keyBorderWidthActivated = s.getDimension(R.styleable.keyboard_keyBorderWidthActivated, 0);
+    keyBorderPaint.setStyle(Paint.Style.STROKE);
+    keyBorderColorLeft = s.getColor(R.styleable.keyboard_keyBorderColorLeft, colorKey);
+    keyBorderColorTop = s.getColor(R.styleable.keyboard_keyBorderColorTop, colorKey);
+    keyBorderColorRight = s.getColor(R.styleable.keyboard_keyBorderColorRight, colorKey);
+    keyBorderColorBottom = s.getColor(R.styleable.keyboard_keyBorderColorBottom, colorKey);
     s.recycle();
     _keyLabelPaint = initLabelPaint(Paint.Align.CENTER, null);
     _keySubLabelPaint = initLabelPaint(Paint.Align.LEFT, null);