https://okawa-womens.clinic/js/stickyheader.js

1$(function () {
2  const bodyClass = $('body');//class js_stickyを付与
3  $(window).scroll(function () {
4    const headersize = $('.header_upper').height();//fixed開始する高さdiv
5	const gnavsize = $('.gnav').height();//gnav height
6    if ($(this).scrollTop() > headersize) {
7      bodyClass.addClass('js_sticky');
8		if ( window.matchMedia( 'screen and (max-width:767.98px)' ).matches ) {
9		//sp
10		bodyClass.css('padding-top','0'); 
11		//$('.header').addClass('fixed-top'); 
12		}else{
13		//pc
14		bodyClass.css('padding-top',gnavsize); 
15		$('.gnav').addClass('fixed-top'); 
16		}
17	} else {
18      bodyClass.removeClass('js_sticky');
19	bodyClass.css('padding-top','0'); 
20	$('.gnav').removeClass('fixed-top'); 
21    }
22  });
23});