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Font Awesome Web Application Icons - W3Schools
Font Awesome 5 Communication Icons - W3Schools
Email Icons & Symbols - Flaticon
W3Schools Tryit Editor
Add email icon in font awesome and other icon libraries
How To Add Icons - Font Awesome Docs
How to Add Icons in HTML? - GeeksforGeeks
Font Awesome
Gmail icon in HTML + CSS3 - CodePen
Mail icon using HTML and CSS - Stack Overflow