There are four key points to follow to add a logo in the Bootstrap navigation bar. 1. Use navbar-brand to wrap logo images, it is recommended to set width and height or use img-fluid classes to maintain responsiveness; 2. Use custom CSS to adjust the size and position of the logo, such as max-height and object-fit: contains, and use ms-auto to control the alignment; 3. Use responsive tool classes such as d-none d-md-inline-block to display logos of different sizes to optimize the mobile experience; 4. Coordinate the layout to ensure that container-fluid is used, check the width of navbar-nav, and control navigation folding through navbar-expand-* to ensure that the overall layout is displayed reasonably on different devices.

Adding a logo to the navigation bar of Bootstrap (navbar) is a very common requirement, especially when building a website brand identity. In fact, this operation is not complicated, but there are several details that need to be paid attention to, especially the adaptation of image size and responsive layout.

1. Use navbar-brand to wrap logo pictures

Bootstrap provides a class specifically for brand identity: navbar-brand . You can place the logo image in this class, usually on the far left side of the navigation bar.

 <a class="navbar-brand" href="#">
  <img src="/static/imghw/default1.png"  data-src="logo.png"  class="lazy" alt="How to add a logo to the Bootstrap navbar?"    style="max-width:90%"  style="max-width:90%">
</a>

• navbar-brand has some styles by default, such as font size and color. If you only place pictures, you can adjust the CSS appropriately.
• It is recommended to set width and height for the image, or use Bootstrap's img-fluid class to keep it responsive.

2. Adjust the position and size of the logo

By default, the image of navbar-brand may appear too small or be incorrectly located. You can fine-tune it with custom CSS:

 .navbar-brand img {
  max-height: 40px;
  object-fit: contains;
}

• Use max-height to control the image height while maintaining the proportion.
• object-fit: contain prevents images from being cropped.
• If you want the logo to be centered or right-aligned, you can use ms-auto (Bootstrap 5) to push the brand identity to the right.

For example:

 <a class="navbar-brand ms-auto ms-md-0" href="#">
  <img src="/static/imghw/default1.png"  data-src="logo.png"  class="lazy" alt="How to add a logo to the Bootstrap navbar?">
</a>

3. Responsive processing: Display the appropriate logo under different screen sizes

Some websites will use different sizes of logos on desktop and mobile, or hide text and adjust the size of images. You can combine Bootstrap's responsive tool class to implement it.

 <a class="navbar-brand" href="#">
  <img class="d-none d-md-inline-block lazy"  src="/static/imghw/default1.png"  data-src="logo.png"  alt="How to add a logo to the Bootstrap navbar?"    style="max-width:90%"  style="max-width:90%">
  <img class="d-inline-block d-md-none lazy"  src="/static/imghw/default1.png"  data-src="logo-small.png"  alt="How to add a logo to the Bootstrap navbar?"    style="max-width:90%"  style="max-width:90%">
</a>

• This way, a smaller logo is displayed on a small screen, improving the mobile experience.
• Note that the path and size of the two pictures should be set separately.

4. Coordinate the layout with other elements of the navigation bar

Sometimes after adding a logo, the navigation items will be squeezed together or line-wind. At this time, you can check the following points:

• Make sure navbar uses container or container-fluid package.
• Check if the width of navbar-nav is sufficient.
• If there are too many navigation items, consider using navbar-expand-* to control responsive folding points.

For example:

 <nav class="navbar navbar-expand-lg navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand" href="#"><img src="/static/imghw/default1.png"  data-src="logo.png"  class="lazy" alt="How to add a logo to the Bootstrap navbar?"></a>
    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
      <ul class="navbar-nav ms-auto">
        <li class="nav-item"><a class="nav-link" href="#">Home</a></li>
        <li class="nav-item"><a class="nav-link" href="#">About us</a></li>
      </ul>
    </div>
  </div>
</nav>

• Use ms-auto to make the navigation items appear to the right.
• Adding container-fluid ensures reasonable layout at different resolutions.

Basically that's it. It's not difficult to add a logo to Bootstrap's navbar, but to make it look good on all kinds of devices, you still need to pay attention to responsiveness and layout details.

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