Customize the font size in Bootstrap 5 using REM units

When it comes to setting font sizes for easier calculations in REM values, I currently use this approach:

html { font-size: 62.5%; } 
body { font-size: 1.6rem; } /* 16px */

However, Bootstrap 5 uses the root value (which is typically set at 62.5%) to calculate all sizes. It provides variables like $font-size-root and $font-size-base, and I've tried manipulating those to achieve accurate calculations.

Initially, I attempted setting the root to match HTML value and the base to align with body value, but that resulted in incorrect outcomes. Adjusting either the base or the root to 1.6rem or 1rem also produced wrong results.

I'm curious if there's a way to customize Bootstrap 5 so that when I specify a value like 3.2rem for $h1-font-size, it will output a result equivalent to 32px (computed style).

This would streamline my calculations significantly, ensuring Bootstrap adheres to the same standards as the rest of the CSS.

Thank you in advance for any suggestions! I've conducted some searches here, but unfortunately, didn't find relevant questions.

csssassbootstrap-5

Answer №1

rem units are calculated based on the font size of the html element, with a default size of 16px.

To achieve this effect, simply set the font-size: 10px for the html element. For example:

html { font-size: 10px; }
body { font-size: 1.6rem; } /* This will be equivalent to 16px */

In Bootstrap 5, making this change requires adjusting the SCSS/CSS3 variable for the body font size. Here is an example of how you can do it using CSS:

html { font-size: 10px; }

:root {
  --bs-body-font-size: 1.6rem;
  font-size: var(--bs-body-font-size);
}
<link href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2d4f4242595e595f4c5d6d18031f031d">[email protected]</a>/dist/css/bootstrap.min.css" rel="stylesheet"/>
<html>
  <body>
    <p>This text is now styled as 1.6rem or 16px.</p>
  </body>
</html>

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