Gallery images with bootstrap4 Flexbox

<!DOCTYPE html>
<html>
<head>
  <title>Gallery images with bootstrap4 Flexbox | par NGLESSON</title>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="author" content="Mezgani said">
  <meta name="copyright" content="NGLESSON">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <div class="container-fluid">
    <div class="d-flex flex-row flex-wrap justify-content-center">
        <div class="d-flex flex-column">
            <img src="https://images.unsplash.com/photo-1485963631004-f2f00b1d6606?auto=format&fit=crop&w=668&q=80" class="img-fluid">            
            <img src="https://images.unsplash.com/photo-1502865787650-3f8318917153?auto=format&fit=crop&w=334&q=80" class="img-fluid">
        </div>
        <div class="d-flex flex-column">
            <img src="https://images.unsplash.com/photo-1500816558239-6b91f4256ead?auto=format&fit=crop&w=331&q=80" class="img-fluid">
            <img src="https://images.unsplash.com/photo-1487376318617-f43c7b41e2e2?auto=format&fit=crop&w=750&q=80" class="img-fluid scale">
        </div>
        <div class="d-flex flex-column">
            <img src="https://images.unsplash.com/photo-1497888329096-51c27beff665?auto=format&fit=crop&w=751&q=80" class="img-fluid scale mb-2">
            <img src="https://images.unsplash.com/photo-1505253468034-514d2507d914?auto=format&fit=crop&w=334&q=80"  class="img-fluid">
        </div>
        <div class="d-flex flex-column">
            <img src="https://images.unsplash.com/photo-1502550900787-e956c314a221?auto=format&fit=crop&w=334&q=80" class="img-fluid m-1 p-1">
              <img src="https://images.unsplash.com/photo-1455853659719-4b521eebc76d?auto=format&fit=crop&w=750&q=80" class="img-fluid image m-1 p-1">
        </div>
    </div>
  </div>
</body>
</html>
.container {
  background: #f9f9f9;
}

.flex-column {
  max-width: 260px;
}

img {
  margin: 5px;
}

.scale {
  transform: scaleY(1.05);
  padding-top: 5px; 
}

                                    
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