var height = $(window).height();
$("#container").height(height);
$("#bd").css("padding-top",height/2 - $("#bd").height()/2);

$(window).resize(function(){
   var height = $(window).height();
   $("#bd").css("padding-top",$(window).height()/2 - $("#bd").height()/2);
   $("#container").height(height);
   
});

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