3. Bootstrap4 -通用類別

一、Border

1. 範例：https://webugm.github.io/bootstrap4/border.html
2. 增加

   <span class="border"></span>
   <span class="border-top"></span>
   <span class="border-right"></span>
   <span class="border-bottom"></span>
   <span class="border-left"></span>

    

3. 減少

   <span class="border-0"></span>
   <span class="border-top-0"></span>
   <span class="border-right-0"></span>
   <span class="border-bottom-0"></span>
   <span class="border-left-0"></span>

    

二、邊框色彩

1. 透過通用類別套用邊框的主題色彩

   <span class="border border-primary"></span>
   <span class="border border-secondary"></span>
   <span class="border border-success"></span>
   <span class="border border-danger"></span>
   <span class="border border-warning"></span>
   <span class="border border-info"></span>
   <span class="border border-light"></span>
   <span class="border border-dark"></span>
   <span class="border border-white"></span>

    

三、Border-radius

1. 對一個元素增加 class 以方便的使其角部變圓

   <img src="..." alt="..." class="rounded">
   <img src="..." alt="..." class="rounded-top">
   <img src="..." alt="..." class="rounded-right">
   <img src="..." alt="..." class="rounded-bottom">
   <img src="..." alt="..." class="rounded-left">
   <img src="..." alt="..." class="rounded-circle">
   <img src="..." alt="..." class="rounded-0">