styles.xml

 <style name="FbDialog" parent="@android:style/Theme.Holo.Light">
      <item name="android:windowNoTitle">true</item>
      <item name="android:windowActionBar">false</item>
      <item name="android:windowContentOverlay">@null</item>
      <item name="android:windowBackground">@android:color/transparent</item>
      <item name="android:colorBackgroundCacheHint">@null</item>
      <item name="android:windowIsTranslucent">true</item>
  </style>

WebDialog.java

  /* Change this line inside the WebDialog.java class:
    https://github.com/facebook/facebook-android-sdk/blob/master/facebook/src/com/facebook/widget/WebDialog.java#L60
    to the code block below.
  */

    public static final int DEFAULT_THEME;

    static {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            DEFAULT_THEME = R.style.FbDialog;
        } else {
            DEFAULT_THEME = android.R.style.Theme_Translucent_NoTitleBar;
        }

    }