discourse/app/assets/stylesheets/mobile/new-user.scss

.new-user-wrapper {
  .user-navigation {
    width: 100%;

    .nav-pills {
      overflow-x: auto;
      scrollbar-width: none;

      &::-webkit-scrollbar {
        display: none;
      }
    }
  }

  .user-navigation-secondary {
    font-size: var(--font-up-1);

    .nav-pills {
      flex-wrap: nowrap;
      li {
        flex: 1 0 auto;
      }
    }
  }

  .user-nav-dropdown-list-item {
    flex-direction: column;
  }

  .user-nav-dropdown-chevron {
    margin-left: auto;
  }

  .user-nav-dropdown-button {
    width: 100%;
  }

  .user-nav-dropdown-submenu {
    box-sizing: border-box;
    position: relative;
    top: 0;
    box-shadow: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50%, 1fr));
    padding: 0.5em 0 1em 1.65em;

    li a {
      box-sizing: border-box;
      padding: 0.75em 1em;
      width: 100%;
      @include ellipsis;
    }
  }

  #navigation-bar {
    flex-wrap: nowrap;
  }
}

.new-user-content-wrapper {
  .user-content {
    margin-top: 2em;
  }
}