Bootstrap - Bố cục 2 cột mọi thiết bị

Bố cục lưới hai cột cho mọi thiết bị

<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap Two Column Grid Layouts for Tablets and Desktops</title>
<link href="[email protected]/dist/css/bootstrap.min.css" rel="stylesheet">
<script src="[email protected]/dist/js/bootstrap.bundle.min.js"></script>
    /* Some custom styles to beautify this example */
        padding: 15px;
        font-size: 18px;
        background: #dbdfe5;
        margin-bottom: 15px;
        background: #abb1b8;
    <h2 class="text-center mt-3">Bootstrap Responsive Layout</h2>
	<div class="text-center my-3">Open the output in a new blank tab (Click the arrow next to "Show Output" button) and resize the browser window to understand how the Bootstrap responsive grid system works.</div>
    <div class="container">
        <!--Row with two equal columns-->
        <div class="row">
            <div class="col-md-6">
                <div class="demo-content">.col-md-6</div>
            <div class="col-md-6">
                <div class="demo-content bg-alt">.col-md-6</div>
        <!--Row with two columns divided in 1:2 ratio-->
        <div class="row">
            <div class="col-md-4">
                <div class="demo-content">.col-md-4</div>
            <div class="col-md-8">
                <div class="demo-content bg-alt">.col-md-8</div>
        <!--Row with two columns divided in 1:3 ratio-->
        <div class="row">
            <div class="col-md-3">
                <div class="demo-content">.col-md-3</div>
            <div class="col-md-9">
                <div class="demo-content bg-alt">.col-md-9</div>

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