The game, which ended with Croatia winning 2-0, took place at the Kaliningrad Stadium, built specifically for the World Cup. The official capacity of the arena is 34,000 seats.
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Croatia will next face Argentina on Thursday, while Nigeria will take on Iceland on Friday.
The 2018 FIFA World Cup kicked off on Thursday and will continue until July 15, with the matches set to be played in 11 cities across Russia.