black block when swtich to mobile screen

my site,full screen for destop is good,but there will be black block when swtich to mobile screen
https://www.dajih.org/

how to remove the black block when swtich to mobile screen?
http://www.evernote.com/l/ApILcgw_XZlBKLWdx7D8XgrHE4QY1d3LYpE/

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