Text Colors
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        <!-- Text Color --><span class="text-primary"></span><span class="text-secondary"></span><span class="text-success"></span><span class="text-danger"></span><span class="text-warning"></span><span class="text-info"></span><span class="text-light"></span><span class="text-dark"></span><span class="text-body"></span><span class="text-muted"></span><span class="text-black-50"></span><span class="text-white-50"></span>
          .text-primary
.text-secondary
.text-success
.text-danger
.text-warning
.text-info
.text-light
.text-dark
.text-white
.text-body
.text-muted
.text-black-50
.text-white-50
Background colors
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        <!-- Background Color --><span class="bg-primary"></span><span class="bg-secondary"></span><span class="bg-success"></span><span class="bg-danger"></span><span class="bg-warning"></span><span class="bg-info"></span><span class="bg-light"></span><span class="bg-dark"></span><span class="bg-white"></span><span class="bg-transparent"></span>
          .bg-primary
            .bg-secondary
            .bg-success
            .bg-danger
            .bg-warning
            .bg-info
            .bg-light
            .bg-dark
            .bg-white
            .bg-transparent
          Background gradient
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        <!-- Background Gradient -->By adding a ".bg-gradient" class, a linear gradient is added as background image to the backgrounds.This gradient starts with a semi-transparent white which fades out to the bottom.
          .bg-primary
            .bg-secondary
            .bg-success
            .bg-danger
            .bg-warning
            .bg-info
            .bg-light
            .bg-dark