Image center height

I can't figure out how to center this image vertically, within the bullet points on either side. The template used was the 'one page' file.

Here is the section of HTML:

<div class="row bottommargin-sm">
<div class="col-lg-4 col-md-6 bottommargin">
<div class="col-lg-4 d-md-none d-lg-block center">

  </div>

</div>
</div>

There are 3 feature-box items to the left and three to the right.

Here is the live page: http://luxerone.dsstristate.net/#features
Thanks