Demonstrators hold up placards as they protest against against the outcome of the UK's June 23 referendum on the European Union (EU) in central London, Britain, on June 26, 2016. (Xinhua)

Demonstrators hold up placards as they protest against against the outcome of the UK's June 23 referendum on the European Union (EU) in central London, Britain, on June 26, 2016. (Xinhua)

A fan of Slovakia waits before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

A fan of Germany waits before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

Fans of Slovakia kiss before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

A fan of Slovakia waits before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

Fans cheer before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

Players of Slovakia line up before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

Players of Germany line up before the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

Sami Khedira of Germany competes during the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)

Julian Draxler(L) celebrates with Mats Hummels of Germany during the Euro 2016 round of 16 football match between Germany and Slovakia in Lille, France, June 26, 2016. (Xinhua)