other methods

1. change map colors
   

           
                   const darkmap = new maps.StyledMapType(styledMap, {name: 'Dark Map'});
                   this.map.mapTypes.set('dark_map', darkmap);
                   this.map.setMapTypeId('dark_map');
                 
               

2. set focus buttons
   

           
                   London
                   focus() {
                      this.map.setCenter(this.coords(51.5616, -0.14));
                   }