Horizontal gutters
gutter="x-5" classes can be used to control the horizontal gutter widths. 
The <GridContainer> or <GridContainer type="fluid"> parent may need to be adjusted if larger gutters are used too to avoid unwanted overflow, using a matching padding utility. 
For example, in the following example we've increased the padding with padding="x-4":
<template>
 <Container padding="x-4">
  <Row gutter="x-5">
   <Col>
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
  </Row>
 </Container>
</template>
An alternative solution is to add a wrapper around the Row with the overflow="hidden class:
<template>
 <Container overflow="hidden">
  <Row gutter="x-5">
   <Col>
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
  </Row>
 </Container>
</template>
Vertical gutters
Like the horizontal gutters, the vertical gutters can cause some overflow below the Row at the end of a page. 
If this occurs, you add a wrapper around Row, with the overflow="hidden" class:
<template>
 <Container overflow="hidden">
  <Row gutter="y-5">
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
  </Row>
 </Container>
</template>
Horizontal & vertical gutters
gutter properties can be used to control the horizontal gutter widths, 
for the following example we use a smaller gutter width, so there won't be a need to add the overflow="hidden" wrapper class.
<template>
 <Container>
  <Row :gutter="2">
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
   <Col col="6">
    <b-div padding="3">
     Custom column padding
    </b-div>
   </Col>
  </Row>
 </Container>
</template>
Row columns gutters
Gutter classes can also be added to row columns . In the following example, we use responsive row columns and responsive gutter classes.
<template>
 <Container>
  <Row
   columns="2 lg-5"
   gutter="2 lg-3"
  >
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
   <Col>
    <b-div padding="3">
     Row column
    </b-div>
   </Col>
  </Row>
 </Container>
</template>
No gutters
The gutters between columns in our predefined grid classes can be removed with gutter="0". 
This removes the negative margins from Row and the horizontal padding from all immediate children columns.
Need an edge-to-edge design? Drop the parent Container or type="fluid".
In practice, here's how it looks.
Note you can continue to use this with all other predefined grid classes (including column widths, responsive tiers, reorders, and more).
<template>
 <Row gutter="0">
  <Col col="sm-6 md-8">
   .col-sm-6 .col-md-8
  </Col>
  <Col col="sm-6 md-4">
   .col-6 .col-md-4
  </Col>
 </Row>
</template>