I created a custom module that overrides the addtocart.phtml file. In that module, I also created a css file. Here is what I did:

Here is my layout - catalog_product_view.xml:

<?xml version="1.0"?>
<page layout="1column" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
        <css src="Vendor_Module::css/style.css"/>
        <referenceBlock name="product.info.addtocart">
            <action method="setTemplate">
                <argument class="Magento\Catalog\Block\Product\View" name="template" xsi:type="string">Vendor_Module::product/view/addtocart.phtml</argument>
        <referenceBlock name="product.info.addtocart.additional">
            <action method="setTemplate">
                <argument class="Magento\Catalog\Block\Product\View" name="template" xsi:type="string">Vendor_Module::product/view/addtocart.phtml</argument>

and then I put the style.css in /Vendor/Module/view/frontend/web/css

I thought that in this case the css file could be visible ONLY in the module, but it is not. How can I make it visible ONLY in that phtml file? I mean, I want the css to be able to edit ONLY the files into the module.

Is it possible?


1 Answer 1


You cant make css visible only in a phtml file or only in a module because it gets loaded globally. However, you can continue to include it globally but limit the scope of its effect.

For example, you could add a css class to the outermost element in your template.

<div class="module-outermost-element">
    <div class="something">my stuff</div>
    <div class="something">more of my stuff</div>

Then in your css, prepend all of your css like this

.module-outermost-element .something {
    background-color: #00FF00;
    /* more css here */

On another note, it's not best practice to include the css directly in the head the way you are doing it. That adds additionall http requests to an already heavy-on-requests page load. You should use LESS so it's compiled and included with Magento's css.

You can do so by including your code in Vendor/Module/web/css/source/_module.less. This file will get included automatically.

Update in response to question posted in comments. To add that css only for specific products:

  • Go the product edit page for each product
  • Scroll down to the Design section
  • Add your css include in the Layout Update XML section as shown in the screenshot below

  • Mmm, I understand. And how can I solve my issue? I created the custom module only for certain products. How can I use that css ONLY for those products? Oct 5, 2019 at 19:49
  • That one is easy. Updating my answer momentarily. Oct 5, 2019 at 19:50
  • Answer updated. Oct 5, 2019 at 19:56
  • Oh wow, didn't know that. Still it is not the best thing to do actually since I have something like 20-30 products and I would have more. Is there a faster way? Oct 5, 2019 at 21:16
  • It actually is the best way. You can probably do it in bulk from the product grid. Use the checkboxes and select “Update Attributes”. The field should be there I think Oct 5, 2019 at 21:29

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