weseek__growi/src/client/styles/scss/_navbar.scss

.grw-navbar {
  .nav-link,
  .nav-item.confidential {
    display: flex;
    align-items: center;
    min-height: $grw-navbar-height;
    padding: 0 1rem;
  }

  .nav-link {
    &:hover {
      background: rgba(0, 0, 0, 0.1);
    }

    &:focus {
      background: rgba(0, 0, 0, 0);
    }
  }
  .nav-item.confidential {
    background: rgba(0, 0, 0, 0.2);
  }
}