A customer asked me to increase the size of the navbar, so far so good. I increased it and had no problem, however, when I go down the page and upload again, the navbar goes behind the slider.
Problem with z-index . So leave your navbar that will work.
.navbar {
border-bottom: 0px solid #d1d1d1;
padding-top: 20px;
z-index: 3;
}