As of 2022, I'm currently favoring the BS5 Icon Set.
All you need to do is link to the CDN for the stylesheet:
<link rel="stylesheet" href="https://email@example.com/font/bootstrap-icons.css">
There are several key advantages to using icons over images:
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You can specify the color using span class (noted via on page style or an external stylesheet):
<span class="blood"><i class="material-icons">favorite</i> </span>
Note: Fontawesome requires
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.1/css/all.min.css"> in your CSS.
SVGs also offer the flexibility of changing size and color and with SVGs, you aren't limited to the icons in the toolset above. A tutorial is forthcoming.
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With all FontAwesome Icons, we can increase the size of the icons and/or spin 'em!
Or a ball bounce
Or make a heartbeat...
Or heart burst...
Call attention to something important...
Or ask for a review...