Fix background on mobile photo page with dark theme

app/assets/stylesheets/color_themes/dark/mobile.scss

@@ -43,6 +43,8 @@ body {
   .stream-element.unread { background-color: $gray; }
   .stream-element.read { background-color: $gray-darker; }
 
+  #show_content .photo { border-color: $border-grey; }
+
   .header-full-width { border-bottom: 1px solid $border-grey; }
 
   .user_aspects {

app/assets/stylesheets/mobile/mobile.scss

@@ -281,7 +281,7 @@ footer {
 
   .photo {
     text-align: center;
-    background-color: #FFFFFF;
+    background-color: $framed-background;
     border-style: solid;
     border-width: 1px;
     box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);