diff --git a/AndroidCalculator/Base.lproj/Main.storyboard b/AndroidCalculator/Base.lproj/Main.storyboard
index df8d7c0..281296c 100644
--- a/AndroidCalculator/Base.lproj/Main.storyboard
+++ b/AndroidCalculator/Base.lproj/Main.storyboard
@@ -235,21 +235,21 @@
                                         <rect key="frame" x="20" y="31" width="34" height="21"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                        <nil key="textColor"/>
+                                        <color key="textColor" white="0.33333333329999998" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                         <nil key="highlightedColor"/>
                                     </label>
                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="：" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="mAs-9p-7fV">
                                         <rect key="frame" x="349" y="27" width="18" height="21"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                        <nil key="textColor"/>
+                                        <fontDescription key="fontDescription" type="system" weight="black" pointSize="17"/>
+                                        <color key="textColor" white="0.33333333329999998" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                         <nil key="highlightedColor"/>
                                     </label>
                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="：" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Hq8-DN-xNf">
                                         <rect key="frame" x="349" y="33" width="18" height="21"/>
                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
-                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
-                                        <nil key="textColor"/>
+                                        <fontDescription key="fontDescription" type="system" weight="black" pointSize="17"/>
+                                        <color key="textColor" white="0.33333333329999998" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                         <nil key="highlightedColor"/>
                                     </label>
                                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="＿" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="RT6-kl-3Um">