magento2 – Install Font awesome in Magento 2.3.5

I’m, trying to include the font awesome icons on my project, here is what I’ve done.

I downloaded font awesome from the website and placed the css here:
appdesignfrontendelastronhealthcarethemewebcssfontawesome.css

I created the file default_head_blocks.xml in appdesignfrontendelastronhealthcarethemeMagento_Themelayout

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <head>
        <!--fontawesome css-->
        <css src="https://magento.stackexchange.com/css/fontawesome.css" />
    </head>
</page>

Then on my phtml file I’m using the <i class="fas fa-info"></i> but all get is a square with a ?…. can anybody help? Going mad here…. Thanks !
enter image description here