old_contents: const $ = require('jquery');
  
  $(document).ready(function(){
    $('#splitter').mousedown(function(e){
      e.preventDefault();
      $(document).mousemove(function(e){
        $('.content').css("width",$(document).width()-e.pageX+2);
        $('.side-bar').css("width",e.pageX+2);
      })
    });
    $(document).mouseup(function(e){
      $(document).unbind('mousemove');
    });
  });
new_contents: const $ = require('jquery');
  
  var splitterLocation;
  
  $(document).ready(function(){
    $('#splitter').mousedown(function(e){
      e.preventDefault();
      $(document).mousemove(function(e){
        splitterLocation = e.pageX;
        $('.content').css("width", $(document).width() - splitterLocation);
        $('.side-bar').css("width", splitterLocation);
      })
    });
    $(document).mouseup(function(e){
      $(document).unbind('mousemove');
    });
  });
  
  $(window).resize(function() {
    if(typeof splitterLocation === "undefined") 
      return;
      
    $('.content').css("width", $(document).width() - splitterLocation);
  });
subject: Fix a bug that .content does not fit with the window (instead, blank area appears on the right side) when the window is resized.