<p class="mt-5">Hello, world!</p>
m t - 5
{property}{sides}-{size}

HTML Element, Table, List 등의 요소들에 일관성있게 스타일을 적용 시키는 기본 단계
<h1 class = "display-1"> Display 1</h1>
<h1 class = "display-2"> Display 2</h1>
<h1 class = "display-3"> Display 3</h1>
<h1 class = "display-4"> Display 4</h1>
<h1 class = "display-5"> Display 5</h1>
<h1 class = "display-6"> Display 6</h1> <p class = "text-primary">.text-primary</p>
<p class = "text-primary-emphasis"> .text-primary-emphasis</p>
<p class = "text-secondary"> text-secondary</p>
<p class = "text-secondary-emphasis"> .text-secondary-emphasis</p>
<p class = "text-success">.text-success</p>
<p class = "text-success-emphasis"> .text-success-emphasis</p>
<div class="p-3 mb-2 bg-primary text-white">.bg-primary</div>
<div class="p-3 mb-2 bg-primary-subtle text-emphasis-primary">.bg-primary-subtle</div>
<div class="p-3 mb-2 bg-secondary text-white">.bg-secondary</div>
<div class="p-3 mb-2 bg-secondary-subtle text-emphasis-primary">.bg-secondary-subtitle</div>
<div class="p-3 mb-2 bg-success text-white">.bg-success</div>
<div class="p-3 mb-2 bg-success-subtitle text-emphasis-primary">.bg-success-subtitle</div>
<div class="p-3 mb-2 bg-danger text-white">.bg-danger</div>