Creating a black and white grid HTML/CSS - html

Question

I am trying to create a 3 by 3 black and white grid. But instead only black square is showing. I have tried using Bootstrap.
My one square of the grid should cover 3 grids space as per bootstrap grid system and I am using padding-top:100% to maintain the aspect ratio for the squares in the 3 by 3 grid.
body {
margin: 0;
color: pink;
}
.square {
width: 100%;
padding-top: 100%;
background-color: black;
}
.square-w {
width: 100%;
padding-top: 100%;
background-color: white;
}
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet" />
<div class="container-fluid">
<div class="row">
<div class="col-md-3">
<div class="square"></div>
</div>
<div class=" col-md-3 ">
<div class="square-w"></div>
</div>
<div class=" col-md-3 ">
<div class="square"></div>
</div>
</div>
<div class="row">
<div class=" col-md-3">
<div class="square-w"></div>
</div>
<div class="col-md-3 ">
<div class="square"></div>
</div>
<div class="col-md-3">
<div class="square-w"></div>
</div>
</div>
<div class="row">
<div class="col-md-3 ">
<div class="square"></div>
</div>
<div class="col-md-3 ">
<div class="square-w"></div>
</div>
<div class="col-md-3 ">
<div class="square"></div>
</div>
</div>
</div>

Answer 1

Your screen view might be too small.
Changing all the col-md-3 classes to col-sm-3 allows it to be shown on my view
JSFiddle: https://jsfiddle.net/2k5523ym/1/

Answer 2

You just need to put below code in css
.nopadding {
padding: 0 !important;
margin: 0 !important;
}
and then assign nopadding class to every col-md-3 div
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" rel="stylesheet" />
<div class="container-fluid">
<div class="row">
<div class="col-md-3 nopadding">
<div class="square"></div>
</div>
<div class=" col-md-3 nopadding">
<div class="square-w"></div>
</div>
<div class=" col-md-3 nopadding">
<div class="square"></div>
</div>
</div>
<div class="row">
<div class=" col-md-3 nopadding">
<div class="square-w"></div>
</div>
<div class="col-md-3 nopadding">
<div class="square"></div>
</div>
<div class="col-md-3 nopadding">
<div class="square-w"></div>
</div>
</div>
<div class="row">
<div class="col-md-3 nopadding">
<div class="square"></div>
</div>
<div class="col-md-3 nopadding">
<div class="square-w"></div>
</div>
<div class="col-md-3 nopadding">
<div class="square"></div>
</div>
</div>
</div>
Hope this help you