body { padding-top: 56px; }
/* --- Bootstrap 4 fixed-top patch --- */
body {
  padding-top: 56px;  /* prevent content from hiding under navbar */
}

.navbar.fixed-top,
.navbar.fixed-top.bg-dark {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1030;
}