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HTML 

              
                <!-- Bootstrap loaded via CDN -->
<body>
	<div class="textbox">
		<h1 class="header">Из бутстрапа в CSS grid</h1>
		<p>Q: Зачем это вообще?</p>
		<p>A: Причин много (см. <a href="https://medium.com/@tallys/bootstrap-to-css-grid-87b3f5f830e4">статью на Medium</a> и ее <a href="http://css-live.ru/articles/ot-butstrapa-k-css-gridam.html">перевод</a>). В основном я хотела всех «плюшек» CSS Grid, но не могла позволить себе удалить старый код или сломать его в старых браузерах. Шаг назад, два шага вперед. Меняйте размер окна браузера и находите себе самые разные возможности. Спасибо CSS за гибкость!
	</div>
 <div class="container css-grid-container css-grid--card">
  <div class="row">
   <div class="col-md-4 col-lg-3">
    <div class="card">
			<h1>Some content!</h1>
			<div class="image-container">
				<img src="https://pbs.twimg.com/media/Cq-inMBWEAAZyZ_.jpg" alt="My cats (Lumen and Waffle) cuddled up in a blanket"/></div>
			<p> This line is longer, but it doesn't break anything!</p>
    </div>
   </div>

   <div class="col-md-4 col-lg-3">
    <div class="card">
			<h1>Some content!</h1>
			<div class="image-container">
				<img src="https://pbs.twimg.com/media/Cq-inMBWEAAZyZ_.jpg" alt="My cats cuddled up in a blanket"/></div>
			<p>Some *more* content!</p>
    </div>
   </div>
	 <div class="col-md-4 col-lg-3">
    <div class="card">
			<h1>Some content!</h1>
			<div class="image-container">
				<img src="https://pbs.twimg.com/media/Cq-inMBWEAAZyZ_.jpg" alt="My cats cuddled up in a blanket"/></div>
			<p>Some *more* content!</p>
    </div>
   </div>
   <div class="col-md-4 col-lg-3">
    <div class="card">
			<h1>Some content!</h1>
			<div class="image-container">
				<img src="https://pbs.twimg.com/media/Cq-inMBWEAAZyZ_.jpg" alt="My cats cuddled up in a blanket"/></div>
			<p>Some *more* content!</p>
    </div>
   </div>
		 <div class="col-md-4 col-lg-3">
    <div class="card">
			<h1>Some content!</h1>
			<div class="image-container">
				<img src="https://pbs.twimg.com/media/Cq-inMBWEAAZyZ_.jpg" alt="My cats cuddled up in a blanket"/></div>
			<p>Some *more* content!</p>
    </div>
   </div>
  </div>
 </div>

</body>
!

CSS 

              
                /* Инструкция: меняйте размер окна браузера с поддержкой гридов и смотрите, какие крутые штуки CSS может вам сделать!

+ Выравнивание высот карточек для каждого ряда
+ Настраиваемые интервалы между колонками и рядами!
+ Произвольные брейкпойнты, и хватит уже довольствоваться бутстраповскими!
+ И т.д.!

Затем, чтобы увидеть, как выглядит оригинальный Bootstrap найдите две строчки @supports(display:grid) в коде ниже, и поменяйте на что-нибудь другое - лично мне нравится писать @supports(display:gridlock), суперское фейковое свойство и каламбур сразу, которое фактически говорит браузеру выполнять код внутри ТОЛЬКО если браузер поддерживает display:gridlock, а его ни один браузер не поддерживает. Тыдыщ! Теперь вы смотрите это в старом браузере!

*один иомент, за которым надо следить - если у вас старая версия автопрефиксера, убедитесь, что он не добавляет префиксы к display: grid для Edge!

*/

//Настраиваем рабочую область
body {
	background: #222;
	font-family: 'Bad Script', sans-serif;
	margin-top: 20px;
	
	a {
		color: lightblue;
		text-decoration: underline;
	}
	
	.header {
		font-family: 'Bad Script', sans-serif;
		text-align: center;
		font-size: 3em;
	}
	
	p {
		font-size: 2.4rem;
	}
	
	.textbox {
		border-top: 4px solid hsl(153, 48, 53);
		border-bottom: 4px solid hsl(153, 48, 53);
		padding: 10px;
		color: #efefef;
		margin: auto;
		max-width: 1160px;
		background: hsla(333, 47, 27, .86);
		margin-bottom: 30px;
	}
}

// Наш маленький компонент карточки
.card {
	background: #efefef;
	padding: 1px 10px;
	border-radius: 19px / 6px;
	box-shadow: 1px 2px 3px 1px #111;
	margin-bottom: 20px;
	@media(min-width: 992px) {
		height: 400px;
	}

	.image-container {
		overflow: hidden;
		margin-bottom: 7px;
	}
	img {
		max-width: 100%;
		border-radius: 3px;
	}
	h1 {
		font-size: 3.5rem;
		text-align: center;
		margin: .5rem 0;
	}
}

// Фактически убираем бутстраповские стили, несовместимые с CSS-гридами, на уровне контейнера
.css-grid-container {
	@supports(display: grid) {
		padding: 0;
		&:before {
			display: none;
		}
		div[class^="col-"] {
			width: 100% !important;
			padding: 0;
		}
		.row {
			display: grid;
			margin: 0;
			&:before {
				display: none;
			}
		}
	}
}

// Теперь можно менять наши карточки как нам угодно на уровне контейнера
.css-grid--card {
	@supports(display: grid) {
		.row {
			grid-column-gap: 5px;
			grid-row-gap: 7px;
			padding: 5px;
			grid-template-columns: 1fr;
			
			.card {
				//только если хотите растянуть карточкм на 100% высоты грид-контейнера - иначе сбросьте на auto;
				height: 100%;
				margin-bottom: 0;
			}

			//произвольные брейкпойнты, нет проблем!
			@media (min-width: 697px) and (max-width: 1099px) {
				grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
				align-items: stretch;

				.card {
					height: auto;
				}
			}

			//произвольные брейкпойнты, нет проблем!
			@media (min-width: 1100px) {
				grid-template-columns: repeat(3, 1fr);
				grid-column-gap: 12px;
				grid-row-gap: 8px;
			}
			
			@media (min-width: 1400px) {
				//Они даже не должны быть одинаковыми! Пробуйте разные комбинации!
				grid-template-columns: 1.1fr 2fr 1.3fr 1.1fr;
				grid-column-gap: 3px;
				grid-row-gap: 8px;
			}
		}
	}
}
!

JS
!
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