Classes aren't displaying properly for elements inside

Is there a way to display the header only in a small size using the col-sm-* class of the div inside a container? It seems like the col-sm-* class is not working correctly and not floating them properly. 

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>
    <div class="container-fluid" style="background-color:purple">
        <div id="header" class="d-none d-sm-block d-md-none">
            <div class="container">
                <div class="col-sm-3" style="background-color:red">  a </div>
                <div class="col-sm-6" style="background-color:blue"> b  </div>
                <div class="col-sm-3" style="background-color:green"> c  </div>
            </div>
        </div>
    </div>

htmlcssbootstrap-4

Answer №1

It's important to remember the row element in your Bootstrap layout.

Every column in Bootstrap should be placed within a row classed div.

Check out the corrected code below:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<div class="container-fluid" style="background-color:purple">
    <div id="header" class="d-none d-sm-block d-md-none">
        <div class="container">
            <div class="row">
                <div class="col-sm-3" style="background-color:red">a</div>
                <div class="col-sm-6" style="background-color:blue">b</div>
                <div class="col-sm-3" style="background-color:green">c</div>
            </div>
        </div>
    </div>
</div>

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