Bootstrap 4 row-cols

Example

<div class="container">
	<div class="row row-cols-2">
		<div>
			<img src="/upload/95/03142214821461_t.jpg" class="img-fluid">
		</div>
		<div>
			<img src="/upload/a5/03142810768902_t.jpg" class="img-fluid">
		</div>
		<div>
			<img src="/upload/95/03142214821461_t.jpg" class="img-fluid">
		</div>
		<div>
			<img src="/upload/a5/03142810768902_t.jpg" class="img-fluid">
		</div>
	</div>
</div>

Result: