What is the best way to customize bootstrap styles?

Currently, I am attempting to modify basic CSS attributes within the default theme that is included with a new ASP.NET MVC 5 application in Visual Studio 2013. Specifically, my goal is to change the background color of the navigation menu.

With the help of Firebug, I have identified the property that needs to be altered and its new value is:

.navbar-inverse { background-color: #5B80A5}

Initially, I tried to add the overridden CSS line in the Site.css file because I noticed the following lines in BundleConfig.cs:

    bundles.Add(new StyleBundle("~/Content/css").Include(
              "~/Content/bootstrap.css",
              "~/Content/site.css"));

Despite this, the background color of the navigation menu did not change as expected.

Next, I searched for .navbar-inverse within my project and the search results were as follows:

Web\Content\bootstrap-theme.css(240):.navbar-inverse {
Web\Content\bootstrap-theme.css(249):.navbar-inverse .navbar-nav > .active > a {
...

I added the custom CSS line at the end of each of the above files, but unfortunately, the changes did not take effect. I made sure to rebuild the project after each modification and cleared the browser cache, but to no avail.

Does anyone have any suggestions on how to successfully override default bootstrap styles? I appreciate any help as this issue is really frustrating!

Some related questions that did not provide a solution:

Overriding bootstrap styles, How to override bootstrap input box style in table?, Cant override bootstrap

Answer №1

Invalid file name - remember to use "Site.css" instead of "site.css". I encountered the same problem and fixed it without making any other modifications...

bundles.Add(new StyleBundle("~/Content/css").Include(
          "~/Content/bootstrap.css",
          "~/Content/Site.css"));

Answer №2

To enhance the specificity of your custom styles for the .navbar-inverse class compared to Bootstrap's default styles, create a unique class that precedes it. You can apply this custom class to your <body> tag and then use it to prefix your style overrides.

.myCustomStyle .navbar-inverse

If you are unable to modify your HTML directly, you can still achieve specificity by utilizing common HTML tags:

body .navbar-inverse

While this method also increases specificity, it is recommended to use the first approach for better code readability.

By following this practice, you eliminate concerns about file placement as CSS specificity will consistently prioritize your custom styles over Bootstrap's classes. Additionally, the prefix in your class name helps simplify debugging processes by clearly indicating ownership.

Answer №3

Best Practice for CSS Order in _layout.cshtml

Optimizing CSS order is crucial in _layout.cshtml. By placing the CSS reference before the bootstrap, you ensure that custom CSS takes priority over the bootstrap styles. In the example provided, the site.css reference is positioned above the bootstrap.min.css reference in the Shared/_Layout.cshtml file.

Answer №4

To resolve the issue, remove either the bootstrap.min.css file or the bootstrap.css file from your project. For more information on a similar issue, check out this post: Troubleshooting CSS changes not taking effect in MVC App

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