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Html Resources

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<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>

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{} CSS Resources

https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css

Bootstrap 4 Borders - Border color