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Bootstrap rows has a margin (left and right) of -15px.
As far as I know this is mainly by two reasons:
.container has a padding (left and right) of 15px
col-* have a gutter of 15px. So in order to avoid the blank space created by the gutter on the first column (on its left side) and the space created by the gutter on the last column (on its right side) the row has a margin (left and right) of -15px.
I'm just wondering, why not to remove the padding of the container and just set the padding/margin of a row to 0?
It will produce the same effect, the first column will have 15px of distance to the .container, and the same for the last column.
What I'm missing?
I've checked: Negative left and right margin of .row class in Bootstrap and Bootstrap's .row margin-left: -15px - why is it outdented (from the docs) but I don't see any reason to use negative margins instead of 0 padding.
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If you want to move an element in the other direction, you can give CSS a negative value: margin-left: -20px will move the element twenty pixels to the left.”
If removing the minus margin from the row than one should practice to remove the column padding becuase row minus margin is to handle the padding of the same amount in the column. To remove minus margin recommeded way is to use no-gutters class or g-0 class as per the version of bootstrap. Show activity on this post.
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.
Rows have a negative left/right margin of -15px. The Container padding of 15px is used to counteract the negative margins of the Row. This is to keep content evenly aligned on the edges of the layout. If you don't put a Row in a Container, the Row will overflow it's container, causing an undesirable horizontal scroll.
It's because the containers are meant to be used to contain any content, not just the grid rows and columns. Without padding on the container, content is forced up against the edge of the layout and doesn't align with the other content...
<div class="container px-0">
<p>This content is aligned with the outer left edge and doesn't align with grid content.</p>
<div class="row m-0">
<div class="col-sm-4">
grid content
</div>
<div class="col-sm-4">
grid content
</div>
<div class="col-sm-4">
grid content
</div>
</div>
</div>
https://codeply.com/go/23PqWB19ol
You can see several examples of container used for other than grid content the Bootstrap examples
Negative margins also work better for Responsive Design. Many people ask "why not just adjust the padding on the first and last columns?". This demo shows why
Related: Do you need to use Bootstrap's "container" and "row" if your content is to span the whole width?
181
Here is your simple and easy answer
Go to your class where you want to give a negative margin and use this method.
Example for margin top
mt-n3
Example for margin bottom
mb-n2
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