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HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

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JavaScript

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Add External Scripts/Pens

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Format on Save

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Code Indentation

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HTML

              
                <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.1/css/bootstrap.min.css">
<!-- <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css"> -->
<!-- <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"> -->
<!-- <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.0/css/bootstrap.min.css"> -->
<!-- <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> -->

<div class="container">
  Default container
</div>

<div class="d-flex">
  <div class="container">
    Container in flex parent
  </div>
</div>

<nav class="navbar navbar-expand-md navbar-dark bg-dark text-white my-3">
  <button class="navbar-toggler mr-auto mb-2 bg-light" data-toggle="collapse" data-target="#myNavbar">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="myNavbar">
    <div class="container-fluid border border-success">
      <div class="row flex-fill border border-danger">
        <div class="col-lg-3 bg-info">
          123
        </div>
        <div class="col-lg-9 bg-warning">
          456
        </div>
      </div>
    </div>
  </div>
</nav>

<div class="row border border-danger">
  <div class="col-lg-3 bg-info">
    123
  </div>
  <div class="col-lg-9 bg-warning">
    456
  </div>
</div>

<div style="height: 300px;">
	<div class="container h-100 d-flex flex-column">
		<div class="row justify-content-between">
			<div class="col-sm-9">
				<h3>Example heading</h3>
			</div>
		</div>
		<div class="row flex-grow-1">
			Content area
		</div>
	</div>
</div>

<div class="container">
  <div class="row">
    <div class="col">
      <pre>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Recusandae porro alias ad sequi dolores temporibus officiis, soluta fugiat numquam distinctio doloremque omnis maiores ex autem? A ipsum id sed laborum!
      </pre>
    </div>
    <div class="col">
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Facere itaque dolore rem culpa a eos molestiae nostrum. Odit ratione quaerat laudantium numquam atque aliquam quae, provident repudiandae, asperiores soluta dignissimos.
    </div>
  </div>
</div>

<div class="container">
  <div class="row">
    <div class="col">
      <pre>
        Lorem ipsum dolor sit amet consectetur adipisicing elit.
      </pre>
    </div>
    <div class="col">
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Facere itaque dolore rem culpa a eos molestiae nostrum. Odit ratione quaerat laudantium numquam atque aliquam quae, provident repudiandae, asperiores soluta dignissimos.
    </div>
  </div>
</div>


<div class="container">
  <div class="row">
    <div class="col min-w-0">
      <pre>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Recusandae porro alias ad sequi dolores temporibus officiis, soluta fugiat numquam distinctio doloremque omnis maiores ex autem? A ipsum id sed laborum!
      </pre>
    </div>
    <div class="col min-w-0">
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Facere itaque dolore rem culpa a eos molestiae nostrum. Odit ratione quaerat laudantium numquam atque aliquam quae, provident repudiandae, asperiores soluta dignissimos.
    </div>
  </div>
</div>

<div class="d-flex flex-wrap my-3">
  <div class="row flex-fill mx-0">
    <div class="col-12">First row</div>
  </div>
  <div class="row flex-fill mx-0">
    <div class="col-12">Second row</div>
  </div>
</div>

              
            
!

CSS

              
                .container {
  margin-top: 1rem;
  background-color: rgba(255,0,0,.15);
  border: 1px solid rgba(255,0,0,.25);
}

.row {
  flex: unset !important;
  background-color: rgba(0,0,255,.15);
  border: 1px solid rgba(0,0,255,.25);
}

[class^="col"] {
  background-color: rgba(0,0,255,.15);
  border: 1px solid rgba(0,0,255,.25);
}

.min-w-0 { min-width: 0; }

              
            
!

JS

              
                
              
            
!
999px

Console