Background
Convey meaning through color with a handful of color utility classes. Includes support for styling links with hover states, too.
Background on BootstrapSolid colors
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<div class="p-3 d-flex flex-center bg-primary false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-primary </code><p class="mt-2 text-white">#3874ff</p></pre>
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<div class="p-3 d-flex flex-center bg-secondary false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-secondary </code><p class="mt-2 text-white">#49525d</p></pre>
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<div class="p-3 d-flex flex-center bg-success false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-success </code><p class="mt-2 text-white">#25b003</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-info false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-info </code><p class="mt-2 text-white">#0097eb</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-warning false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-warning </code><p class="mt-2 text-white">#e5780b</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-danger false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-danger </code><p class="mt-2 text-white">#ec1f00</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-light border border-300" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-light </code><p class="mt-2 text-black">#f6f7f8</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-dark false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-dark </code><p class="mt-2 text-white">#15181b</p></pre>
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.bg-primary
#3874ff
.bg-secondary
#49525d
.bg-success
#25b003
.bg-info
#0097eb
.bg-warning
#e5780b
.bg-danger
#ec1f00
.bg-light
#f6f7f8
.bg-dark
#15181b
Grays
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-black false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-black </code><p class="mt-2 text-white">#000</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-1100 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-1100 </code><p class="mt-2 text-white">#15181b</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-1000 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-1000 </code><p class="mt-2 text-white">#2b3036</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-900 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-900 </code><p class="mt-2 text-white">#49525d</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-800 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-800 </code><p class="mt-2 text-white">#5a6573</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-700 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-700 </code><p class="mt-2 text-white">#6d7a8a</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-600 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-600 </code><p class="mt-2 text-white">#84909e</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-500 false" style="height: 180px"><pre class="text-center"><br><code class="text-white">.bg-500 </code><p class="mt-2 text-white">#9aa3af</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-400 false" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-400 </code><p class="mt-2 text-black">#b1b9c2</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-300 false" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-300 </code><p class="mt-2 text-black">#e2e5e9</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-200 border border-300" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-200 </code><p class="mt-2 text-black">#f1f2f4</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-100 border border-300" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-100 </code><p class="mt-2 text-black">#f6f7f8</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-soft border border-300" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-soft </code><p class="mt-2 text-black">#fcfcfd</p></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-white border border-300" style="height: 180px"><pre class="text-center"><br><code class="text-black">.bg-white </code><p class="mt-2 text-black">#fff</p></pre>
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.bg-black
#000
.bg-1100
#15181b
.bg-1000
#2b3036
.bg-900
#49525d
.bg-800
#5a6573
.bg-700
#6d7a8a
.bg-600
#84909e
.bg-500
#9aa3af
.bg-400
#b1b9c2
.bg-300
#e2e5e9
.bg-200
#f1f2f4
.bg-100
#f6f7f8
.bg-soft
#fcfcfd
.bg-white
#fff
Gradients
<div class="row g-0">
<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-primary bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-primary </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-secondary bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-secondary </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-success bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-success </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-info bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-info </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-warning bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-warning </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-danger bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-danger </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-light bg-gradient border border-300" style="height: 180px"><pre class="text-center"><code class="text-black">.bg-gradient</code><br><code class="text-black">.bg-light </code></pre>
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<div class="col-6 col-sm-4 col-lg-3">
<div class="p-3 d-flex flex-center bg-dark bg-gradient false" style="height: 180px"><pre class="text-center"><code class="text-white">.bg-gradient</code><br><code class="text-white">.bg-dark </code></pre>
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.bg-gradient
.bg-primary
.bg-gradient
.bg-secondary
.bg-gradient
.bg-success
.bg-gradient
.bg-info
.bg-gradient
.bg-warning
.bg-gradient
.bg-danger
.bg-gradient
.bg-light
.bg-gradient
.bg-dark