/* リセット */
html, body {
    margin: 0;
    padding: 0;
}

header {
  background:#c8e3e0;
  height:200px;
}
 
/* グローバルナビ */
#globalNavi ul {
    display: flex;
    background: #111;
    justify-content: space-around;
    list-style-type: none;
    margin: 0 auto;
    padding: 0.6rem 0;
    width: 100%;
}
 
#globalNavi a {
    display: block;
    color: white;
    padding: 12px 24px;
    text-decoration: none;
}

.fixed {
    position: fixed;
    top: 0;
    padding: 0;
    width: 100%;
    z-index: 1000;
}

main {
  height:1200px;
  background:#e3e0c8;
}

footer {
  height:200px;
  background:#c8d8e3;
}

$(function() {
    var offset = $('#globalNavi').offset();
 
    $(window).scroll(function () {
        if ($(window).scrollTop() > offset.top) {
            $('#globalNavi').addClass('fixed');
        } else {
            $('#globalNavi').removeClass('fixed');
        }
    });
});