fontawesome 4 size code example
Example 1: change font awesome icon size
<i class="fas fa-camera fa-xs"></i>
<i class="fas fa-camera fa-sm"></i>
<i class="fas fa-camera fa-lg"></i>
<i class="fas fa-camera fa-2x"></i>
<i class="fas fa-camera fa-3x"></i>
<i class="fas fa-camera fa-5x"></i>
<i class="fas fa-camera fa-7x"></i>
<i class="fas fa-camera fa-10x"></i>
Example 2: font awesome size
<span style="font-size: 500px; color: Tomato;">
<i class="fas fa-camera"></i>
</span>
Example 3: how to change size of the font awsome
Font Awsome Sizes