Whenever I try to use a component again, the CSS styling I applied to it doesn't show up

In my attempt to understand a puzzling occurrence, please bear with me as the details may be a bit messy.

I have created a Header Component that occupies the entire viewport and includes a NavigationBar Component. The Header Component functions perfectly in another instance where I used it. However, when I tried reusing it recently, the NavigationBar inside it acted strangely (all CSS disappeared).

Here is the Header component with the following styling (which works fine): {position: relative; height: 100vh; width: 100%;}

    import React from "react";
    import NavigationBar from "../NavigationBar/NavigationBar";
    
    import "./Header.css";
    
    const Header = (props) => (
      <div className="blog-header">
        <NavigationBar />
          {props.children}
      </div>
    );
    
    export default Header;

The NavigationBar is a simple React-Bootstrap Navbar. However, I have omitted the contents of navigationItems because I believe they are irrelevant to the current issue:

    import React from "react";
    import { Container, Navbar, Nav, NavbarBrand } from "react-bootstrap";
    import Logo from "../Logo/Logo";
    
    import "./NavigationBar.css";
    
    const navigationItems = []
    const NavigationBar = (props) => (
      <Container>
        <Navbar id="navigation" bg="transparent" variant="dark" expand="lg">
          <div className="div-brand d-flex flex-grow-1">
            <NavbarBrand href="/">
              <Logo />
            </NavbarBrand>
            <div className="w-100 text-right">
              <Navbar.Toggle data-toggle="collapse" data-target="#da-navbarNav">
                <span className="navbar-toggler-icon"></span>
              </Navbar.Toggle>
            </div>
          </div>
          <Navbar.Collapse
            className="text-uppercase flex-grow-1 text-right"
            id="da-navbarNav"
          >
            <Nav className="ml-auto flex-nowrap">
              {navigationItems.map((navItem, index) => {
                return (
                  <Nav.Item key={index}>
                    <Nav.Link
                      id={navItem.id ? navItem.id : null}
                      href={navItem.path}
                      className={navItem.classes.join(" ")}
                      onClick={(event) =>
                        props.navItemClick(event, window.location.pathname, navItem)
                      }
                    >
                      {navItem.placeholder}
                    </Nav.Link>
                  </Nav.Item>
                );
              })}
            </Nav>
          </Navbar.Collapse>
        </Navbar>
      </Container>
    );

Navbar.css code:

    #navigation {
      z-index: 10;
    }
    
    #navigation .div-brand {
      align-items: center;
    }
    
    .navbar-dark .navbar-nav .nav-link {
      color: rgba(255, 255, 255, 0.75);
      letter-spacing: 1px;
      font-size: 0.95rem;
      font-weight: bold;
      line-height: 24px;
      width: 6.4rem;
      text-align: center;
    }
    
    .navbar-dark .navbar-nav .nav-link:hover,
    .navbar-dark .navbar-nav .nav-link:active {
      color: #da3833;
    }
    
    .navbar-dark #btn-contact {
      background-color: #da3833;
      border-radius: 3px;
      text-align: center !important;
    }
    
    .navbar-dark #btn-contact:hover,
    .navbar-dark #btn-contact:active {
      color: white !important;
    }
    
    @media (max-width: 992px) {
      .navbar-dark .navbar-nav .nav-link {
        text-align: right;
        margin-top: 0.2rem;
        margin-left: auto;
      }
    
      .navbar-dark .navbar-nav .nav-item {
        text-align: right;
        width: 100%;
      }
    
      .navbar-toggler {
        outline: none !important;
      }
    }

I am currently reusing this component within another component that has the following styling:

    .article-header {
      height: inherit;
      width: inherit;
      position: absolute;
      top: 0;
    }

    import React, { useState, useEffect, useCallback } from "react";
    import Header from "../../../components/Header/Header";
    
    import "./ArticlePage.css";
    
    const ArticlePage = (props) => {
      const [id, setId] = useState(null);
    
      const loadQueryParams = useCallback(() => {
        setId(props.match.params.id ? props.match.params.id : null);
      }, []);
    
      useEffect(() => loadQueryParams(), [loadQueryParams]);
    
      return (
        <div>
          <Header>
            <div
              className="article-header"
              style={{ backgroundColor: "black", opacity: "0.2" }}
            >
              {id}
            </div>
          </Header>
        </div>
      );
    };
    export default ArticlePage;

If you have any insights on what might be causing this issue, please feel free to share. I have provided links to how the navigationbar should look and how it actually renders.

If you require additional information or details, please let me know! Thank you!

EDIT: Here is a demonstration as requested

Answer №1

I successfully resolved the issue. The root cause was that my "bootstrap.css" directory housing my bootstrap theme was not being universally imported in "index.js", but rather it was located within "index.html".

It is important to mention that I was implementing a Router to navigate to a new Component where I utilized Navbar. Due to the global import of css files missing, the styling was not applied.

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