1 - Set CSS on parent div to display: flex;
2 - Set CSS on parent div to flex-direction: column;
Note that this will make all content within that div line up top to bottom. This will work best if the parent div only contains the child and nothing else.
3 - Set CSS on parent div to justify-content: center;
Here is an example of what the CSS will look like:
.parentDivClass {_x000D_
display: flex;_x000D_
flex-direction: column;_x000D_
justify-content: center;_x000D_
}
_x000D_