Spacing: Margin

<h2>Margin</h2>
<p class="mb-2">This sentence has 0.125rem (browser renders to 2px) of margin spacing below it</p>
<p class="mb-4">This sentence has 0.25rem (browser renders to 4px) of margin spacing below it</p>
<p class="mb-8">This sentence has 0.5rem (browser renders to 8px) of margin spacing below it</p>
<p class="mb-12">This sentence has 0.75rem (browser renders to 12px) of margin spacing below it</p>
<p class="mb-16">This sentence has 1rem (browser renders to 16px) of margin spacing below it</p>
<p class="mb-24">This sentence has 1.5rem (browser renders to 24px) of margin spacing below it</p>
<p class="mb-32">This sentence has 2rem (browser renders to 32px) of margin spacing below it</p>
<p class="mb-64">This sentence has 4rem (browser renders to 64px) of margin spacing below it</p>
<p class="mb-80">This sentence has 5rem (browser renders to 80px) of margin spacing below it</p>
<p class="mb-12 mb-md-36 mb-lg-72">This sentence has 12px of margin below it on small screens, 36px of margin on MEDIUM size screens and 72px on LARGE size screens.</p>