message: Fix background and add initialFirstResponder for first button (mac)
diff: <rect key="frame" x="0.0" y="0.0" width="300" height="323"/>
  <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
  </view>
  + <color key="fillColor" name="feedback-background-color"/>
  </box>
  <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="sqC-ri-2J8">
  <rect key="frame" x="36" y="265" width="229" height="18"/>
  <constraint firstItem="LfR-bu-tys" firstAttribute="top" secondItem="sqC-ri-2J8" secondAttribute="bottom" constant="5" id="ycY-wp-cGX"/>
  </constraints>
  </view>
  + <connections>
  + <outlet property="initialFirstResponder" destination="gae-h6-aWA" id="MWd-1C-OCJ"/>
  + </connections>
  <point key="canvasLocation" x="282" y="371.5"/>
  </window>
  </objects>
  <namedColor name="black-text-color">
  <color red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
  </namedColor>
  + <namedColor name="feedback-background-color">
  + <color red="0.98039215686274506" green="0.98431372549019602" blue="0.9882352941176471" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
  + </namedColor>
  <namedColor name="green-color">
  <color red="0.15686274509803921" green="0.80392156862745101" blue="0.25490196078431371" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
  </namedColor>
  