Icons issue in Chrome and Safari.

Hi!

I have a website: https://ift.tt/2HC9ezZ

The issue is: when I view my website in "Safari" - the phone and email icon in the header is showing. But when I view the website in "Chrome" and "Firefox" - the icons show show, instead I see a box.

Here's the screenshot for the reference:

With Icons: Safari
View attachment 240480

Without Icons: Chrome & Firefox
View attachment 240479

Kindly advise, how to solve this issue.
Thanks & Regards!

from HTML & Website Design https://ift.tt/2Hvc62z
via IFTTT