添加或者移除边框样式
目录1
目录1.1
目录1.2
目录2
目录2.1
目录2.2

<span class="border"></span> <span class="border border-0"></span> <span class="border border-top-0"></span> <span class="border border-right-0"></span> <span class="border border-bottom-0"></span> <span class="border border-left-0"></span>
边框颜色样式
<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>
圆角相关样式
<span class="rounded"></span> <span class="rounded-top"></span> <span class="rounded-right"></span> <span class="rounded-bottom"></span> <span class="rounded-left"></span> <span class="rounded-circle"></span> <span class="rounded-0"></span>
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