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$(".btn1").click(function(){
  $("div").scrollTop(100);
});

$(selector).scrollTop(offset)

      var login_css = document.createElement('link');
      login_css.id = 'login_css';
      login_css.rel = 'stylesheet';
      login_css.type = 'text/css';
      login_css.media = 'screen';
      login_css.href = css_url;
      document.body.appendChild(login_css);

    // add div element
    var divE = document.createElement('div');
    divE.id = 'login_container';
    divE.style.visibility = 'hidden';
    divE.style.opacity = 0;
    
    var login_HTML = "";

    var d = document.documentElement || document.body;
    var scrollTop = d.scrollTop > d.offsetTop ? d.scrollTop : d.offsetTop;
    divE.style.top = scrollTop+220+'px';
      
      document.body.appendChild(divE);