Bootstrap change $grid-gutter-width - html

Question

I am using Bootstraps grid system and I need about a 2px space between each column. I've tried Column-Gap but nothing.
Could anyone help?
Code HTML:
<div class="container">
<div class="row">
<div class="col-md-3" id="one">
<h3>Pink</h3>
</div>
<div class="col-md-3" id="two">
<h3>Purple</h3>
</div>
<div class="col-md-3" id="three">
<h3>Green</h3>
</div>
<div class="col-md-3" id="four">
<h3>Orange</h3>
</div>
</div>
<div class="row2">
<div class="col-md-3" >
<h3>Things that are Pink</h3>
<p>Pigs</p>
<p>Barbie</p>
<p>Some Skins</p>
<p>Ham</p>
</div>
<div class="col-md-3" >
<h3>Things that are Purple</h3>
<p>Prince</p>
<p>Goths</p>
<p>Paint</p>
<p>Berries</p>
</div>
<div class="col-md-3" >
<h3>Things that are Green</h3>
<p>Grass</p>
<p>Peas</p>
<p>Leafs</p>
<p>Apple</p>
</div>
<div class="col-md-3" >
<h3>Things that are Orange</h3>
<p>Orange</p>
<p>Ice-Lolly</p>
<p>Essex</p>
<p>Carrots</p>
</div>
</div>
</div>
</body>
</html>
Code: CSS
body {
font-family: 'Roboto Mono', monospace;
}
#media screen and (min-width: 768px)
.jumbotron {
padding-top: 48px;
padding-bottom: 48px;
}
.jumbotron {
text-align: center;
}
.container {
text-align: center;
}
#one {
border: 5px solid pink;
border-radius: 20px;
background-color: pink;
color: white;
}
#two {
border: 5px solid purple;
border-radius: 20px;
background-color: purple;
color: white;
}
#three {
border: 5px solid green;
border-radius: 20px;
background-color: green;
color: white;
}
#four {
border: 5px solid orange;
border-radius: 20px;
background-color: orange;
color: white;
}
.row2 {
margin-top: 30px;
margin-right: -15px;
margin-left: -15px;
}

Answer 1

A quick guide to resizing Bootstrap’s gutter width
Resizing Bootstrap's Gutter
A simple method of changing Bootstrap's default gutter size.
HTML
<div class="gutter-2 row">
<div class="col-md-6"></div>
<div class="col-md-6"></div>
`
CSS
.gutter-2.row {
margin-right: -1px;
margin-left: -1px;
}
.gutter-2 > [class^="col-"], .gutter-2 > [class^=" col-"] {
padding-right: 1px;
padding-left: 1px;
}`

Answer 2

to change the gutter you have two way:
change #grid-gutter-width in variables.less:327, but then you will need to compile the generated css yourself.
change #grid-gutter-width and download a new custom build at Bootstrap#Customize
Note that the customize section will be dropped in twitter bootstrap 4.