Add custom css file into Magento 2 for all pages – Today, I will explain example to add mycustom.css file to Magento 2.

Need default_head_blocks.xml in theme as per given path. Your directory path should be as per given example.

Vendor/themename/Magento_Theme/layout/default_head_blocks.xml

Find  tag and place below code –

<css src=\"css/mycustom.css\"/>

Add css file in below path –

app/design/frontend/{Vendor}/{theme}/web/css/styles.css

Now remove cache and deploy static content.

Check your console mycustom.css will be loaded.

Easy one…!!! Thank You.!