bootstrap 4 order class for mobile view code example
Example 1: ordering collumns in bootstrap
<div class="container">
<div class="row">
<div class="col">
First, but unordered
</div>
<div class="col order-12">
Second, but last
</div>
<div class="col order-1">
Third, but first
</div>
</div>
</div>
Example 2: change order columns bootstrap
<div class="row">
<div class="col-md-3">
sidebar
</div>
<div class="col-md-9 ">
main
</div>
</div>
// CSS
.row{
display: flex;
flex-flow: column-reverse;
}