I have a custom html template where I have classes.

On layout I have added my css like this:

<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
        <css src="css/application.css" />
        <referenceContainer name="content">
            <block class="Vendor\Application\Block\Main" name="application_send" template="Vendor_Application::application.phtml"/>

And inside PHTML i'm using a javascript component in order to render html template

Just like this:

 <div id="port-form" data-bind="scope:'port-form'">
      <!-- ko template: getTemplate() --><!-- /ko -->
      <!-- ko template: template2--><!-- /ko -->
      <!-- ko template: template3 --><!-- /ko -->
        <script type="text/x-magento-init">
            "#port-form": {
                "Magento_Ui/js/core/app": {
                  "components": {
                        "port-form": {
                            "component": "Vendor_Application/js/port-app-form",
                            "quote_data": <?= /* @escapeNotVerified */ $data ?>,
                            "quantities": <?= /* @escapeNotVerified */ $quantities ?>

It's not taking any effect

I get this error:

Refused to apply style from '.../en_US/css/application.css' because its MIME type ('text/plain') is not a supported stylesheet MIME type, and strict MIME checking is enabled


  • Where exactly is your CSS file placed? May 26 at 22:20
  • You can change : <css src="css/application.css" /> to <css src="Vendor_Application::css/application.css" />
    – nhungo duc
    May 27 at 1:52
  • @MichałBiarda my css is under web/css/application.css May 27 at 2:18
  • @nhungoduc it did not work May 27 at 2:21
  • have you cleared magento cache if so maybe your css part is wrong or maybe your browser cache
    – nhungo duc
    May 27 at 3:13

please add css under app/code/Vendor/Module/view/web/css and add in xml like

 <css src="Vendor_Module::css/application.css" />
  • I'm not using a theme, I'm using it into a module May 27 at 14:25
  • Answer updated. May 27 at 14:55

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