I am not a football fan, so I do not know about it very well, but we passed by a stadium called La Bombonera which is the home of Boca Juniors, one of the top teams in Argentina.
The colour of this team is blue and yellow.
When this team started in the early 20th century, this area was the port town with many immigrants.
One day they said “the flag colour of the country of the first boat arriving next morning will be our colour”, and the country was Sweden.
They seem to care about the colours very much and do not accept any red and white which are the colours of their rival team.
So apparently in the stadiam, the no-smoking sign is painted in blue and yellow and the sign of Coca Cola is in black and white.
I saw a young boy practising football with his father near the stadium.
He was wearing a shirt in blue and yellow, too.