bootstrap auto adjust font size code example

Example 1: how to make font responsive

html { font-size: calc(1em + 1vw); }

Example 2: bootstrap text size

<p class="h1">h1. Bootstrap heading</p>
<p class="h2">h2. Bootstrap heading</p>
<p class="h3">h3. Bootstrap heading</p>
<p class="h4">h4. Bootstrap heading</p>
<p class="h5">h5. Bootstrap heading</p>
<p class="h6">h6. Bootstrap heading</p>