Magento 2 : Adding Custom CSS Files
Adding CSS files that we created ourselves in Magento 2.
Create a filenamecss.css file, for example andhiirawan.css
in
app / design / frontend / [vendor] / [theme] / web / css / andhiirawan.cssthen add the file to the head block:
app / design / frontend / [vendor] / [theme] / Magento_Theme / layout / default_head_blocks.xmlread more at: