fontawesome.com is the next generation of the web’s favorite icon library.
Open link https://fontawesome.com/v5.15/icons/facebook-f
Use below once line code in HTML page to view Facebook icon.
<i class="fab fa-facebook-square"></i> <br> <<i class="fab fa-facebook-f"></i>
Facebook Font will look like as below.
Fontawsome site contains many free icons here is the link https://fontawesome.com/v5.15/icons?d=gallery&p=2&m=free
This site contains many icons of different sizes. SVG files are also available.
Sizes are available for each icon.