Add spacing between vertically stacked columns in Bootstrap 4

Use the new Bootstrap 4 spacing utilities. For example mb-3 adds margin-bottom of 1rem.
No extra CSS is needed.

http://www.codeply.com/go/ECnbgvs9Ez

<div class="container">
    <div class="row">
      <div class="col-md-4 mb-3">
        col 1
      </div>
      <div class="col-md-4 mb-3">
        col 2
      </div>
      <div class="col-md-4 mb-3">
        col 3
      </div>
      <div class="col-md-4 mb-3">
        col 4
      </div>
      <div class="col-md-4 mb-3">
        col 5
      </div>
      <div class="col-md-4">
        col 6
      </div>
    </div>
</div>

The spacing utils are responsive so you can apply them for specific breakpoints (ie; mb-0 mb-md-3)

If you want a CSS solution, use the solution explained in the related 3.x question (it's not dependent on using a form): https://jsfiddle.net/zdLy6jb1/2/

/* css only solution */
[class*="col-"]:not(:last-child){
  margin-bottom: 15px;
}

Note: the col-lg-4 is extraneous in your markup since col-lg-4 col-md-4,
is the same as col-md-4.


see snippet below or jsfiddle

it will work regardless how many cols you have or rows

first ( on big screen ) all rows have margin-bottom except the last one then on medium screen , the rows won't have any margin and the cols will all have margin-bottom except the last col from the last row

.row {
	margin-bottom:30px;
}
.row:last-child{
	margin-bottom:0;
}
.row [class*="col-"] { 
   border:1px solid red;
}

@media only screen and (max-width: 768px) {
	.row { 
	margin:0
	}
	.row [class*="col-"]  {
		margin-bottom:30px;
	}
	.row:last-child [class*="col-"]:last-child{
		margin-bottom:0;
	}
}
<body>

<h1 class="display-3">
hey
</h1>

  <div class="container">

    <div class="row">

      <div class="col-md-4 col-lg-4">
        col 1
      </div>

      <div class="col-md-4 col-lg-4">
        col 2
      </div>

      <div class="col-md-4 col-lg-4">
        col 3
      </div>
</div>
<div class="row">
      <div class="col-md-4 col-lg-4">
        col 4
      </div>

      <div class="col-md-4 col-lg-4">
        col 5
      </div>

      <div class="col-md-4 col-lg-4">
        col 6
      </div>

    </div>

  </div>

</body>

I just worked through a similar problem with a co-worker. Our solution, using only Bootstrap 4, is as follows:

  <div class="col-md-4">
    col 1
  </div>

  <div class="d-block d-md-none col-12 py-3"></div>

  <div class="col-md-4">
    col 2
  </div>

Using the class "w-100" instead of "col-12" for the middle div also works. What's happening here is the d-block makes it display on extra small devices and up, and the d-md-none makes it disappear at medium widths.

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Spacing

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