Small devices (≥576px) → width: 540px
Medium devices (≥768px) → width: 720px
Large devices (≥992px) → width: 960px
Xlarge devices (≥1200px) → width: 1140px
導覽選單：Bootstrap 4 Navs
導覽列：Bootstrap 4 Navigation Bar
文字與特殊字體：Bootstrap 4 Text/Typography
文字顏色與背景顏色搭配：Bootstrap 4 Colors
警告訊息與色彩：Bootstrap 4 Alerts