Tips for personalizing the Bootstrap 5 color palette using CSS

After my previous question was closed as a duplicate, I am posting a new one as the previous answers did not solve my specific issue. The key points that need addressing are:

The linked question addresses Bootstrap CSS customization here (9 answers). If the existing answers do not help, feel free to ask a new question.

The main differences in my inquiry are:

  • The responses in the referenced question relate to older versions of Bootstrap, whereas my focus is on Bootstrap 5 (as indicated in the title).
  • While the mentioned answer discusses SASS for version 5, I am seeking a CSS solution in line with the title.
  • I provided a minimal example in my question, but the linked thread lacks a minimal example resolution.

Below is a brief example of a Bootstrap 5 page. By default, it features black text, white background, and blue accents. How can I adjust this default color scheme using CSS? Would inserting a custom <style> tag work, or should I link another CSS file?

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="66040909121512140716265348574857">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU" crossorigin="anonymous">
  <title>Hello, world!</title>
</head>

<body>

<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckDefault">
  <label class="form-check-label" for="flexCheckDefault">
    Default checkbox
  </label>
</div>
<div class="form-check">
  <input class="form-check-input" type="checkbox" value="" id="flexCheckChecked" checked>
  <label class="form-check-label" for="flexCheckChecked">
    Checked checkbox
  </label>
</div>

<div class="accordion" id="accordionPanelsStayOpenExample">
  <div class="accordion-item">
    <h2 class="accordion-header" id="panelsStayOpen-headingOne">
      <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#panelsStayOpen-collapseOne" aria-expanded="true" aria-controls="panelsStayOpen-collapseOne">
        Accordion Item #1
      </button>
    </h2>
    <div id="panelsStayOpen-collapseOne" class="accordion-collapse collapse show" aria-labelledby="panelsStayOpen-headingOne">
      <div class="accordion-body">
        <strong>This is the first item's accordion body.</strong> It is shown by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
      </div>
    </div>
  </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c8aaa7a7bcbbbcbaa9b888fde6f9e6f9">[email protected]</a>/dist/js/bootstrap.bundle.min.js" integrity="sha384-/bQdsTh/da6pkI1MST/rWKFNjaCP5gBSY4sEBT38Q/9RBh9AH40zEOg7Hlq2THRZ" crossorigin="anonymous"></script>
</body>
</html>

Code excerpt sourced from https://getbootstrap.com/docs/5.1/getting-started/introduction/, https://getbootstrap.com/docs/5.1/forms/checks-radios/, and https://getbootstrap.com/docs/5.1/components/accordion/.

Answer №1

Quick tip: Modifying the entire color scheme with CSS alone can be tricky. Consider using SASS for color scheme changes

But fear not, you can still customize specific Bootstrap styles using CSS overrides.

This principle applies universally across Bootstrap versions. As mentioned in the related answer..

"By appending your CSS rules after the bootstrap.css, and employing adequate CSS specificity, you can successfully override Bootstrap styles"...

For instance..

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e7858888939493958697a7d2c9d6c9d6">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU" crossorigin="anonymous">
  <style>
  /* custom overrides */
  body {
     background-color: pink;
  } 
  </style>
  <title>Hello, world!</title>
</head>

Alternatively, place your overrides in a separate CSS file and reference it,

"A recommended approach is to create a custom.css file for CSS customizations, ensuring that bootstrap.css remains intact. The custom.css should be included after bootstrap.css for the overrides to apply..."

To sum up,

"Take into account CSS Specificity while customizing. Your custom.css overrides must have equal or higher specificity than bootstrap.css selectors"

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