Set compose background color

app/src/main/java/eu/faircode/email/ActivitySignature.java

@@ -174,6 +174,8 @@ public class ActivitySignature extends ActivityBase {
             }
         }, this);
 
+        // Initialize
+        FragmentDialogTheme.setBackground(this, view, true);
         style_bar.setVisibility(View.GONE);
 
         setResult(RESULT_CANCELED, new Intent());

app/src/main/java/eu/faircode/email/FragmentAnswer.java

@@ -152,6 +152,8 @@ public class FragmentAnswer extends FragmentBase {
         });
 
         // Initialize
+        FragmentDialogTheme.setBackground(getContext(), view, true);
+
         cbExternal.setVisibility(View.GONE);
         grpReady.setVisibility(View.GONE);
         style_bar.setVisibility(View.GONE);