请看这个。我用过 bootstrap-4。
/*this css is only for identifying row*/
.row > [class^="col-"] {
background-color: rgba(86, 61, 124, 0.15);
border: 1px solid rgba(86, 61, 124, 0.2);
}Run Code Online (Sandbox Code Playgroud)
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
<div class="container">
<div class="row">
<div class="col-2">
1 of 2
</div>
<div class="col-10">
<div class="row">
<div class="col-12">
Level 2
</div>
<div class="col-12">
Level 2
</div>
</div>
</div>
</div>
</div>Run Code Online (Sandbox Code Playgroud)