.row bootstrap

.row{
    display: flex;
    flex-wrap: wrap;
	margin-right: -15px;
    margin-left: -15px;
}

Bootstrap grid system

<!-- Boostrap Reference -->
https://getbootstrap.com/docs/4.0/layout/grid/

<!-- W3Schools Reference -->
https://www.w3schools.com/bootstrap/bootstrap_grid_system.asp#:~:text=The%20Bootstrap%20grid%20system%20has,or%20greater%20than%201200px%20wide)

Boostrap grid

<div class="row">
  <div class="col-9">.col-9</div>
  <div class="col-4">.col-4<br>Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.</div>
  <div class="col-6">.col-6<br>Subsequent columns continue along the new line.</div>
</div>

Source: getbootstrap.com

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