remove space between header and nav bar in mobile device in twenty thirteen

Hello,

I am using twenty thirteen.

There is a space in my mobile device between header image and navigation bar.

Please check the link :

https://mobiletest.me/iphone_5_emulator/#u=https://www.patanjaliindustries.in

I want to remove that white space. In desktop there is no space. Only problem with mobile device.

Anyone can help please.

Thanks in advance.

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