scinote-web/app/assets/stylesheets/my_modules/shared/layout_overrides.css

.sci--layout-navigation-breadcrumbs {
  background-color: var(--sn-white);
}

.sci--layout-content {
  background-color: var(--sn-white);
}

.title-row {
  background-color: var(--sn-white);
}

.header-actions {
  background-color: var(--sn-white);
  display: flex;
  height: 3rem;
  padding: 0 1.125rem;
  align-items: center;
  gap: 0.5rem;
  align-self: stretch;
  z-index: 205;
  border-bottom: 1px solid var(--sn-light-grey);
}