fa 4 icons code example

Example 1: fontawesome 4.7 icon

<i class="fa fa-facebook" aria-hidden="true"></i>

Example 2: fa icons

<script src='https://kit.fontawesome.com/a076d05399.js'></script>

Example 3: font awesome css

<span style="font-size: 3em; color: Tomato;">
  <i class="fas fa-camera"></i>
</span>

<span style="font-size: 48px; color: Dodgerblue;">
  <i class="fas fa-camera"></i>
</span>

<span style="font-size: 3rem;">
  <span style="color: Mediumslateblue;">
  <i class="fas fa-camera"></i>
  </span>
</span>

Example 4: font awesome fa

Posting random icons in grepper doesn't make sense guys, you need the 
visuals on the page