div по ширине/высоте вьюпорта

// global vars var winWidth = $(window).width(); var winHeight = $(window).height(); // set initial div height / width $('div').css({ 'width': winWidth, 'height': winHeight, }); // make sure div stays full width/height on resize $(window).resize(function(){ $('div').css({ 'width': winWidth, 'height': winHeight, }); });