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使用边界实用程序快速设置元素的边框和边框半径。非常适合图片，按钮或任何其他元素。
边界
将元素添加到元素以删除所有边框或边框。
<span class="border"></span><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>
边框颜色
使用基于主题颜色的实用程序更改边框颜色。
<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>
边界半径
将类添加到元素中，以便轻松使元素的角变圆。
<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">