[twitter-bootstrap] Bootstrap 3, 4 and 5 .container-fluid with grid adding unwanted padding

Use px-0 on the container and no-gutters on the row to remove the paddings.

Quoting from Bootstrap 4 - Grid system:

Rows are wrappers for columns. Each column has horizontal padding (called a gutter) for controlling the space between them. This padding is then counteracted on the rows with negative margins. This way, all the content in your columns is visually aligned down the left side.

Columns have horizontal padding to create the gutters between individual columns, however, you can remove the margin from rows and padding from columns with .no-gutters on the .row.

Following is a live demo:

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h1 {
  background-color: tomato;
}
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<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" id="div1">
  <div class="row">
    <div class="col">
        <h1>With padding : (</h1>
    </div>
  </div>
</div>

<div class="container-fluid px-0" id="div1">
  <div class="row no-gutters">
    <div class="col">
        <h1>No padding : > </h1>
    </div>
  </div>
</div>
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The reason this works is that container-fluid and col both have following padding:

padding-right: 15px;
padding-left: 15px;

px-0 can remove the horizontal padding from container-fluid and no-gutters can remove the padding from col.

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