I would like to see classes added for the 'close' button on some owindows (i.e. popup dialogues/messages).

Currently there is the class button-close-message on only some owindows, including error windows and comment permalinks.

Other owindows have no class on their close button - including the report a bug and flag as objectionable windows. Adding a class to these button would allow for more consistent styling of the close button, like below…