#nav-bar {
  margin-top: var(--zen-element-separation) !important;
  margin-bottom: var(--zen-element-separation) !important;
}
toolbarbutton.titlebar-button {
    height: calc(38px + 2 * var(--zen-element-separation)) !important;
    width: calc(38px + 2 * var(--zen-element-separation)) !important;
    margin-top: calc(-1 * var(--zen-element-separation)) !important;
}