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How can I override a CSS variable defined in a parent element?

Asked on Oct 14, 2025

Answer

To override a CSS variable defined in a parent element, you can redefine the variable in a child element's CSS rule. This allows the child element to use the new value while the parent and other elements remain unaffected.

<!-- BEGIN COPY / PASTE -->
    <style>
      .parent {
        --main-color: blue;
      }
      .child {
        --main-color: red; /* Override the variable */
        color: var(--main-color);
      }
    </style>

    <div class="parent">
      <p>This text is blue.</p>
      <div class="child">
        <p>This text is red.</p>
      </div>
    </div>
    <!-- END COPY / PASTE -->

Additional Comment:

CSS variables (custom properties) are defined using the syntax: --variable-name: value;
To use a CSS variable, reference it with var(--variable-name);
Variables are inherited, so redefining them in a child element changes their value only within that scope.
Ensure the variable is defined before it's used in the CSS rule to avoid fallback issues.

✅ Answered with CSS best practices.

Ask any question about CSS here... and get an instant response.

How can I override a CSS variable defined in a parent element?

Asked on Oct 14, 2025

Answer

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