Add CSS custom properties to the child theme’s style.css, normally under :root for site-wide tokens or a component selector for local values. Then make sure WordPress actually loads that stylesheet: some parent themes enqueue it automatically, while others require a dependency-aware functions.php enqueue. If the site uses a block theme, inspect theme.json first because it commonly owns global design settings.
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What you are adding, and why the child theme matters
CSS variables are officially called custom properties. Their names begin with two hyphens, such as --brand-color, and another declaration reads the value with var(--brand-color). Because custom properties participate in the CSS cascade and inherit by default, one declaration can control colors, spacing, radii, or typography across many selectors.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsA child theme is an extension of a parent theme. It gives you a place for custom files and settings that can survive updates to the parent. The variable declarations themselves are ordinary CSS; the WordPress-specific work is making sure the child theme is valid, active, and loaded in the right order.
| Question | Practical answer |
|---|---|
| Where do global variables go? | Put them in :root in the child stylesheet. |
| Where does a component-only variable go? | Put it on the component selector, such as .card, so descendants can inherit it. |
| Can variables replace a CSS property name? | No. var() supplies a value inside a normal declaration; it cannot become a selector or property name. |
| Do you always need PHP? | No. It depends on how the parent theme loads styles. A classic theme may need an explicit enqueue; a block theme may rely primarily on theme.json. |
Identify the theme architecture before editing files
The loading procedure differs between classic and block themes. Check the active theme in Appearance → Themes, then inspect its files before adding PHP or replacing an existing stylesheet workflow.
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Classic themes
Classic themes commonly load CSS with wp_enqueue_style(). A parent may enqueue both its own stylesheet and the child stylesheet, only the active stylesheet, or neither automatically. The parent’s functions.php and any documented setup determine which case applies. Do not assume that creating a child directory automatically causes its CSS to appear in the page.
Block themes
Block themes use site editing and frequently express settings and styles through theme.json. WordPress documents that a block theme’s style.css loading is optional and can be unnecessary for many design settings; the documented Twenty Twenty-Four example does not load a stylesheet automatically. Read the existing theme.json and style configuration first. Add a stylesheet only for rules that are not suitably represented there, and verify that the relevant front-end or editor CSS is loaded.
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| Decision | Classic theme | Block theme |
|---|---|---|
| Primary design configuration | PHP enqueue plus CSS files are common. | theme.json often centralizes settings and styles. |
| Child stylesheet assumption | May be loaded by the parent, or may require an enqueue. | style.css loading is optional in many setups. |
| First inspection | Parent functions.php and registered style handles. |
Existing theme.json, style settings, and editor/front-end loading. |
Step 1: create or verify the child theme
Child-theme files live in a directory under wp-content/themes. The directory name is the parent theme’s directory name only by convention; the decisive value is the Template header in the child stylesheet.
- Create or open the child directory under
wp-content/themes. - At the directory root, create
style.css. Do not put the theme header in a nested CSS folder. - Use a header like the following, replacing the template value with the parent directory’s exact name:
/*
Theme Name: My Child Theme
Template: parent-theme-folder
*/The Template value is case-sensitive in practice: it must match the parent theme folder exactly, not the theme’s display name. Activate the child theme from Appearance → Themes. If it does not appear as an available child theme, check that the file is named style.css, the header is at the top level, and the template directory is correct.
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Step 2: define custom properties with a deliberate scope
Use :root for shared design tokens
Place values needed by unrelated parts of the site on :root. This gives the tokens a document-wide scope while still allowing more specific rules to override them.
:root {
--brand-color: #14532d;
--surface-color: #ffffff;
--text-color: #1f2937;
--content-gap: 1.5rem;
}Names should describe the role of a value rather than one current use. A semantic name such as --surface-color remains useful if the actual color changes later. Keep the two hyphens, use a consistent naming convention, and remember that custom-property names are case sensitive: --Brand-Color and --brand-color are different names.
Use a component selector for local tokens
A component token belongs on the component when it should not become part of the site-wide API. Descendants inherit it automatically.
.card {
--card-radius: 0.75rem;
border-radius: var(--card-radius);
}This scope makes overrides predictable. A second card variant can set a different --card-radius without changing every element that uses the global tokens.
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Add a fallback when absence is acceptable
When a token may be undefined or invalid, provide a fallback after a comma:
.button {
background: var(--brand-color, #0f766e);
}In a browser that supports custom properties, the fallback is used when --brand-color is missing or produces an invalid value for that declaration. It is not a substitute for custom-property support in browsers that do not implement the feature.
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Use var() wherever a normal CSS property expects a value. The custom property can supply a complete value or one part of a compound value.
body {
color: var(--text-color);
background: var(--surface-color);
}
.site-header {
border-bottom: 1px solid var(--brand-color);
padding-block: var(--content-gap);
}The declaration still needs a valid property name, such as color or padding-block. You cannot write var(--property-name): red, and you cannot use var() to generate a selector. If a variable is missing and no fallback is supplied, the browser treats the affected declaration as invalid and the property falls back according to normal CSS rules.
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Understand inheritance when overriding
A value on :root is available to descendants unless another rule changes it. A component declaration shadows the inherited value for that component and its descendants. Inspect the element that shows the wrong result, not only the element where you originally declared the token; a nearer declaration, a more specific rule, or an invalid value may be winning the cascade.
Step 4: ensure a classic child stylesheet is loaded
Inspect before adding code
Open the parent theme’s enqueue logic and determine whether it already loads the child stylesheet. WordPress notes that parent themes vary: some load both stylesheets, some load only the active stylesheet, and some load no stylesheet automatically. If the parent already enqueues the child, do not add a second call for the same file.
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When the parent does not provide the required setup, add an enqueue to the child theme’s functions.php:
<?php
function my_child_enqueue_styles() {
$parent = 'parent-style';
wp_enqueue_style(
$parent,
get_parent_theme_file_uri( 'style.css' )
);
wp_enqueue_style(
'child-style',
get_stylesheet_uri(),
array( $parent ),
wp_get_theme()->get( 'Version' )
);
}
add_action( 'wp_enqueue_scripts', 'my_child_enqueue_styles' );wp_enqueue_style() is WordPress’s primary stylesheet-enqueue function. The child call lists the parent handle in its dependency array, so WordPress prints the child after the parent. The version argument uses the active child theme’s version metadata and can help browsers fetch a changed file instead of reusing a stale cached copy.
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Do not duplicate handles or files
If the parent already registers a handle named differently, use that actual handle in the dependency array rather than inventing a second parent registration. Duplicate handles or duplicate stylesheet files make source inspection and cascade debugging harder. The correct code is specific to the parent’s implementation, so copy its handle and loading assumptions rather than applying a generic snippet blindly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Step 5: account for block-theme style handling
For a block theme, first locate theme.json and inspect its settings and styles. Global colors, spacing, typography, and other design controls may already be defined there and exposed through the site editor. Adding a parallel set of CSS variables can create two sources of truth.
Keep custom CSS in the child stylesheet when you need selectors or behavior that theme.json cannot express. Then confirm where that CSS is intended to run:
- Front-end rules must be present on the public page.
- Editor-specific rules may need the editor stylesheet path rather than only front-end output.
- Variables used by both contexts must be emitted in both contexts, or components can look correct in one view and unstyled in the other.
Because block themes differ in how they output styles, verify the generated markup and loaded assets instead of assuming that a root style.css is automatically included.
How to verify that the variables work
- Confirm activation. In Appearance → Themes, verify that the child theme is active, not merely installed.
- Check page source or the Network panel. Search for the child stylesheet URL. If it is absent, the problem is loading or theme activation, not the CSS declaration.
- Inspect the computed element. Select an element that should use a token and look for the custom property in computed styles. The browser will show whether it was inherited, overridden, or missing.
- Trace the winning rule. In the Styles panel, identify the declaration that sets the property and any nearer declaration that changes the custom property.
- Test the fallback deliberately. Temporarily remove or rename the token and confirm that a declaration written as
var(--token, fallback)uses its fallback. - Retest after clearing relevant caches. The enqueue version can change the URL’s version query, but a proxy, browser, or optimization layer may still have its own cache.
Troubleshooting common failures
| Symptom | Likely cause | What to check or change |
|---|---|---|
| The child theme is missing from the Themes screen. | Invalid or misplaced header, or an incorrect template directory. | Make sure the root file is named style.css, the header starts at the top, and Template exactly matches the parent folder. |
| The child stylesheet does not appear in source or Network. | The child is inactive, the parent does not load it, or no enqueue was added. | Activate the child, inspect the parent’s enqueue code, and add the explicit classic-theme enqueue only when needed. |
| The parent styles disappeared after adding the child enqueue. | The parent file was never enqueued, or the dependency handle is wrong. | Load the parent first and make the child depend on the exact parent handle. |
| The child CSS loads, but a token has no effect. | Name mismatch, invalid value, or a later declaration overrides it. | Check case and spelling, inspect the custom property in computed styles, and follow the cascade to the winning rule. |
| A component receives the wrong token. | A nearer component declaration or inherited value is shadowing the global token. | Inspect the component and its ancestors; move the token to the intended scope or change the component override. |
| A property silently falls back to an older style. | The referenced token is undefined or invalid for that property. | Define the token in the relevant scope or add a second argument to var() where a fallback is appropriate. |
| Changes are visible in one view but not another. | Front-end and editor styles are being generated or loaded separately. | For a block theme, inspect theme.json and confirm the custom CSS is emitted in every context that needs the token. |
Old colors remain after editing style.css. |
Browser or intermediary caching. | Use the stylesheet version argument, then inspect the requested URL and clear higher-level caches if the old asset is still served. |
Choose the right token scope and loading strategy
| Choice | Use it when | Trade-off |
|---|---|---|
:root |
The value is a shared site token, such as a brand color or content gap. | Easy to reuse globally, but available to every selector and therefore easier to override accidentally. |
| Component selector | The value belongs only to one component family or variant. | Limits unintended reach, but descendants outside that component cannot use it. |
Bare var(--token) |
The token is mandatory and an absent value should expose a configuration error. | No local safety net when the token is undefined or invalid. |
var(--token, fallback) |
A safe default is acceptable if the token is missing. | Prevents a declaration from failing, but can hide a naming or loading mistake if used indiscriminately. |
| Parent-provided child load | The parent already registers and prints the child stylesheet correctly. | No extra PHP, but upgrades or parent changes should be rechecked. |
| Explicit enqueue | The parent does not load the child, or the dependency order is not guaranteed. | More control, but the handle, path, and dependency must match the parent setup. |
A complete small example
The following layout keeps global tokens in one place, gives a card its own radius, and uses a fallback for a button background. Place the CSS in the active child stylesheet after the theme header.
:root {
--brand-color: #14532d;
--surface-color: #ffffff;
--text-color: #1f2937;
--content-gap: 1.5rem;
}
body {
color: var(--text-color);
background: var(--surface-color);
}
.site-header {
border-bottom: 1px solid var(--brand-color);
padding-block: var(--content-gap);
}
.card {
--card-radius: 0.75rem;
border-radius: var(--card-radius);
padding: var(--content-gap);
}
.button {
background: var(--brand-color, #0f766e);
color: var(--surface-color);
}Here, changing --brand-color updates both the header border and button background. Changing --card-radius affects cards and their descendants only. If the global brand token is unavailable, the button still has the declared fallback in browsers that support custom properties.
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Quick Recap
Pre-publish checklist
- The child theme is active and its root
style.csshas a validTheme Nameand exactTemplatevalue. - Global tokens are on
:root; component-only tokens are scoped to their component. - Every use has the correct, case-sensitive custom-property name.
- Fallbacks are present where an undefined token should not invalidate a declaration.
- The child stylesheet appears in page source or the Network panel.
- In a classic theme, the parent handle is loaded first and the child depends on it.
- No duplicate parent or child stylesheet enqueue is producing competing copies.
- In a block theme,
theme.jsonhas been checked and front-end/editor output has been verified separately.
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