How to increase spacing between blocks of text (bootstrapv4)?

Question

css

How to increase spacing between blocks of text (bootstrapv4)? see screen below

<div class="col-md-4">
                <div class="media">
                    <img class="align-self-start mr-3" src="img/icon/customize.png" alt="Generic placeholder image">
                    <div class="media-body">
                        <h5 class="mt-0">Accusan timar</h5>
                        <p class="h4block2">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantiu</p>
                    </div>
                </div>
                <div class="media">
                    <img class="align-self-start mr-3" src="img/icon/time.png" alt="Generic placeholder image">
                    <div class="media-body">
                        <h5 class="mt-0">Accusan timar</h5>
                        <p class="h4block2">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantiu</p>
                    </div>
                </div>
                <div class="media">
                    <img class="align-self-start mr-3" src="img/icon/music.png" alt="Generic placeholder image">
                    <div class="media-body">
                        <h5 class="mt-0">Accusan timar</h5>
                        <p class="h4block2">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantiu</p>
                    </div>
                </div>
            </div>
            <div class="col-md-4">
                <img src="img/phone.png">
            </div>
            <div class="col-md-4">
                <div class="media">
                    <img class="align-self-start mr-3" src="img/icon/support.png" alt="Generic placeholder image">
                    <div class="media-body">
                        <h5 class="mt-0">Accusan timar</h5>
                        <p class="h4block2">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantiu</p>
                    </div>
                </div>
                <div class="media">
                    <img class="align-self-start mr-3" src="img/icon/send.png" alt="Generic placeholder image">
                    <div class="media-body">
                        <h5 class="mt-0">Accusan timar</h5>
                        <p class="h4block2">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantiu</p>
                    </div>
                </div>
                <div class="media">
                    <img class="align-self-start mr-3" src="img/icon/camera.png" alt="Generic placeholder image">
                    <div class="media-body">
                        <h5 class="mt-0">Accusan timar</h5>
                        <p class="h4block2">Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantiu</p>
                    </div>
                </div>
            </div>

Answer 1

Either a line break <br/>in the right amount, or the appropriate rules in CSS.

Answer 2

The block can be given classes:
If it is padding, then it is written p-
If it is margin, then it is written m-
It is also indicated from which side and through the dash the size of the indent from 1 to 5.
Example:

class="pt-5"   Это паддинг топ 5й уровень
class="ml-3"  Это margin left 3й уровень

The side is indicated by the first letter
t = top
l = left
r = right
b = bottom
Another example.
It is necessary to increase the indents on the right and bottom of the div block.

<div class="pt-5 pb-5">
</div>