<div class="container">
<div class="row">
<div class="col-9">1列目: .col-9</div>
<div class="col-4">2列目: .col-4</div>
<div class="col-6">3列目: .col-6</div>
</div>
</div>
.row > [class*=col] {
padding-top: .75rem;
padding-bottom: .75rem;
background-color: rgba(86,61,124,.15);
border: 1px solid rgba(86,61,124,.2);
}
.row {
background-color: rgba(86,61,124,.15);
}
.container {
margin-top: 30px;
}
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