font-icons.css code example

Example 1: bootstrap font asesome cdn

The correct one -> Give an upvote if it helps

<link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css"
    />

Example 2: 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 3: font-awesome cdn

<link rel="stylesheet" href="path/to/font-awesome/css/font-awesome.min.css">