gtk: Add a workaround for gnome-mines

src/gtk/sass/apps/_gnome-3.22.scss

@@ -1255,3 +1255,11 @@ evview.content-view.view:selected {

                                
                                
                                
                            
                                
                                    
                                        
                                            1255  
                                            button.osd.scroll_button {
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            1256  
                                              margin: 4px;
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            1257  
                                            }
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1258 +
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1259 +
                                        /**
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1260 +
                                         * Mines
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1261 +
                                         */
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1262 +
                                        
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1263 +
                                        grid.minefield > button.tile {
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1264 +
                                          border-style: solid;
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        1265 +
                                        }