.Row Bootstrap
.row{
display: flex;
flex-wrap: wrap;
margin-right: -15px;
margin-left: -15px;
}
GutoTrosla
.row{
display: flex;
flex-wrap: wrap;
margin-right: -15px;
margin-left: -15px;
}<div class="container">
<div class="row row-cols-2">
<div class="col">Column</div>
<div class="col">Column</div>
<div class="col">Column</div>
<div class="col">Column</div>
</div>
</div>.col-12{
flex: 0 0 100%;
max-width: 100%;
}